+-------------+-------------------------------+-----------------------+
| ![](media/  |                               | **Advisory Circular** |
| image1.wmf) |                               |                       |
+-------------+-------------------------------+-----------------------+
| **U.S.      |                               |                       |
| D           |                               |                       |
| epartment** |                               |                       |
|             |                               |                       |
| **of        |                               |                       |
| Trans       |                               |                       |
| portation** |                               |                       |
|             |                               |                       |
| Federal     |                               |                       |
| Aviation    |                               |                       |
|             |                               |                       |
| Adm         |                               |                       |
| inistration |                               |                       |
+-------------+-------------------------------+-----------------------+

+-------------------------------+------------------+-------------------+
| **Subject:** SPECIFICATION    | **Date:**        | **AC No.:**       |
| FOR OBSTRUCTION LIGHTING      | 09/12/06         | 150/5345-43F      |
| EQUIPMENT                     |                  |                   |
|                               | **Initiated      | **Change:**       |
|                               | by:** AAS-100    |                   |
+-------------------------------+------------------+-------------------+

**1. PURPOSE.** This advisory circular (AC) contains the Federal
Aviation Administration (FAA) specification for obstruction lighting
equipment.

**2. EFFECTIVE DATE.** Effective 6 months after the date of this
circular, only that equipment qualified per this specification will be
listed in AC 150/5345-53, Airport Lighting Equipment Certification
Program.

**3. CANCELLATION.** AC 150/5345-43E, *Specification for Obstruction
Lighting Equipment,* dated October 19, 1995, is canceled.

**4. APPLICATION.** The specifications contained in this AC are
recommended by the FAA in all applications involving development of this
nature. For airport projects receiving Federal funds under the airport
grant assistance program, the use of these standards is mandatory.

**5. DEFINITIONS.**

a.  Beam Spread. The angle between the two directions in a plane for
    which the intensity is equal to 50 percent of the minimum specified
    peak beam effective intensity.

b.  Vertical Aiming Angle. The angle between the horizontal and a
    straight line intersecting the beam at its maximum intensity.

c.  Steady-Burning (fixed) Light. A light having constant luminous
    intensity when observed from a fixed point.

d.  Effective Intensity. The effective intensity of a flashing light is
    equal to the intensity of a steady-burning (fixed) light of the same
    color that produces the same visual range under identical conditions
    of observation.

**6. PRINCIPAL CHANGES.**

a.  Added a requirement for the use of ultraviolet and ozone resistant
    materials with xenon flashtubes.

b.  Added a requirement for solar radiation resistant plastic parts and
    applicable testing.

c.  Added a requirement for surge protection and testing for equipment
    with solid-state devices.

d.  Added requirements from FAA Engineering Brief #67 as necessary to
    provide requirements for obstruction lighting using alternative
    light sources (ALDs).

e.  Added optional radiated emissions requirements with no testing
    required.

**7. METRIC UNITS.** To promote an orderly transition to metric units,
this AC includes both English and metric dimensions. The metric
conversions may not be exact equivalents, and until there is an official
changeover to the metric system, the English dimensions will govern.

**8. COMMENTS OR SUGGESTIONS** for improvements to this AC should be
sent to:

> Manager, Airport Engineering Division
>
> Federal Aviation Administration
>
> ATTN: AAS-100
>
> 800 Independence Avenue, S.W.
>
> Washington, DC 20591

**9. COPIES OF THIS AC.** The Office of Airport Safety and Standards
makes this AC available online at www.faa.gov.

![](media/image2.png){width="2.5881944444444445in"
height="0.5965277777777778in"}

DAVID L. BENNETT

Director of Airport Safety and Standards

**TABLE OF CONTENTS**

CHAPTER 1. SCOPE AND CLASSIFICATION.
[1](#chapter-1.-scope-and-classification.)

1.1 Scope. [1](#scope.)

1.2 Equipment Classification. [1](#equipment-classification.)

CHAPTER 2. REFERENCED DOCUMENTS. [3](#chapter-2.-referenced-documents.)

2.1 General. [3](#general.)

2.2 FAA Advisory Circulars (ACs). [3](#faa-advisory-circulars-acs.)

2.3 FAA Engineering Briefs. [3](#faa-engineering-briefs.)

2.4 Military Standards and Specifications.
[3](#military-standards-and-specifications.)

2.5 Code of Federal Regulations (CFR).
[3](#code-of-federal-regulations-cfr.)

2.6 Institute of Electrical and Electronics Engineers (IEEE)
Publications.
[3](#institute-of-electrical-and-electronics-engineers-ieee-publications.)

2.7 International Standardization Organization (ISO) Publications.
[3](#international-standardization-organization-iso-publications.)

2.8 International Civil Aviation Organization (ICAO).
[3](#international-civil-aviation-organization-icao.)

2.9 Illuminating Engineering Society (IES).
[3](#illuminating-engineering-society-ies.)

CHAPTER 3. EQUIPMENT REQUIREMENTS.
[7](#chapter-3.-equipment-requirements.)

3.1 General. [7](#general.-1)

3.2 Environmental Requirements. [7](#environmental-requirements.)

3.3 Design Requirements. [7](#design-requirements.)

3.3.1 Light Unit. [7](#light-unit.)

3.3.2 Light Covers. [7](#light-covers.)

3.3.3 Light Colors. [7](#light-colors.)

3.3.4 Aiming (for L-856 and L-857). [8](#aiming-for-l-856-and-l-857.)

3.3.5 Control Unit. [8](#control-unit.)

3.3.6 Input Voltage. [9](#input-voltage.)

3.3.7 Performance Criteria. [9](#performance-criteria.)

3.3.8 Transient Protection. [9](#transient-protection.)

3.3.9 Radiated Emissions. [10](#radiated-emissions.)

3.3.10 Warning Labels. [10](#warning-labels.)

3.3.11 Interlock Switches. [10](#interlock-switches.)

3.3.12 Nameplate. [10](#nameplate.)

3.3.13 Optional Arctic Kit [10](#optional-arctic-kit)

3.3.14 Component Ratings. [11](#component-ratings.)

3.3.15 Leakage Current. [11](#leakage-current.)

3.4 Performance Requirements. [11](#performance-requirements.)

3.4.1 Photometric. [11](#photometric.)

3.4.2 Flash Rate and Duration. [14](#flash-rate-and-duration.)

3.4.3 System Flashing Requirements. [15](#system-flashing-requirements.)

3.4.4 Intensity Step Changing. [16](#intensity-step-changing.)

3.5 Instruction Manual. [16](#instruction-manual.)

CHAPTER 4. EQUIPMENT QUALIFICATION REQUIREMENTS.
[19](#chapter-4.-equipment-qualification-requirements.)

4.1 Qualification Procedures. [19](#qualification-procedures.)

4.2 Qualification Tests. [19](#qualification-tests.)

4.2.1 Photometric Test. [19](#photometric-test.)

4.2.2 High Temperature Test. [20](#high-temperature-test.)

4.2.3 Low Temperature Test. [20](#low-temperature-test.)

4.2.4 Rain Test. [21](#rain-test.)

4.2.5 Wind Test. [21](#wind-test.)

4.2.6 Humidity Test. [21](#humidity-test.)

4.2.7 Salt Fog Test. [21](#salt-fog-test.)

4.2.8 Sunshine Test. [21](#sunshine-test.)

4.2.9 Transient Protection Test. [22](#transient-protection-test.)

4.2.10 System Operational Test. [22](#system-operational-test.)

4.2.11 Leakage Current Test. [23](#leakage-current-test.)

4.2.12 Visual Examination. [23](#visual-examination.)

CHAPTER 5. PRODUCTION TEST REQUIREMENTS.
[25](#chapter-5.-production-test-requirements.)

5.1 System Production Tests. [25](#system-production-tests.)

5.2 Incandescent Light Unit Production Tests.
[25](#incandescent-light-unit-production-tests.)

5.3 Alternative Lighting Devices (ALD).
[25](#alternative-lighting-devices-ald.)

5.4 Discharge Light Unit Production Test.
[25](#discharge-light-unit-production-test.)

5.5 Production Operational Test. [25](#production-operational-test.)

5.6 Production Photometric Test. [26](#production-photometric-test.)

5.7 Production Test Records. [27](#production-test-records.)

5.8 Production Test Equipment. [27](#production-test-equipment.)

**LIST OF TABLES**

Table 1. L-856 Intensity Requirements.
[13](#__RefHeading___Toc145824397)

Table 2. L-857 Intensity Requirements.
[13](#__RefHeading___Toc145824398)

Table 3. L-865 Intensity Requirements.
[14](#__RefHeading___Toc145824399)

Table 4. Flash Characteristics for Obstruction Lights
[15](#__RefHeading___Toc145824400)

Table 5. L-856/L-857 Production Photometric Requirements.
[26](#__RefHeading___Toc145824401)

Table 6. L-865/866/864^(1)^ /885^(1)^ Production Photometric
Requirements. [26](#__RefHeading___Toc145824402)

# CHAPTER 1. SCOPE AND CLASSIFICATION.

## 1.1 Scope.

This specification sets forth the Federal Aviation Administration (FAA)
requirements for obstruction lighting equipment used to increase
conspicuity of structures to permit early obstruction recognition by
pilots.

## 1.2 Equipment Classification.

> **Type** **Description**
>
> L-810 Steady-burning red obstruction light
>
> L-856 High intensity flashing white obstruction light, 40 Flashes Per
> Minute (FPM)
>
> L-857 High intensity flashing white obstruction light, 60 FPM
>
> L-864 Flashing red obstruction light, 20-40 FPM
>
> L-865 Medium intensity flashing white obstruction light, 40 FPM
>
> L-866 Medium intensity flashing white obstruction light, 60 FPM
>
> L-885 Flashing red obstruction light, 60 FPM

**Intentionally left blank.**

# CHAPTER 2. REFERENCED DOCUMENTS.

## 2.1 General. 

The following is a listing of documents referenced in this AC.

## 2.2 FAA Advisory Circulars (ACs).

> AC 70/7460-1 *Obstruction Marking and Lighting*
>
> AC 150/5345-53 *Airport Lighting Equipment Certification Program*

## 2.3 FAA Engineering Briefs.

> Engineering Brief #67 *Light Sources Other Than Incandescent and Xenon
> for Airport and Obstruction Lighting Fixtures*

## 2.4 Military Standards and Specifications.

> MIL-STD-810F *Environmental Engineering Considerations and Laboratory
> Tests*
>
> MIL-C-7989 *Cover, Light-Transmitting, for Aeronautical Lights,*
> *General Specification for*

## 2.5 Code of Federal Regulations (CFR).

> Title 47 *Telecommunications*
>
> Part 15 *Radio Frequency Devices*

## 2.6 Institute of Electrical and Electronics Engineers (IEEE) Publications.

> IEEE C62.41-1991 *IEEE Recommended Practice on Surge Voltages in
> Low-Voltage AC Power Circuits*
>
> IEEE C62.45 *IEEE Recommended Practice on Surge Testing for Equipment
> Connected to Low-Voltage (1000 V and Less) AC Power Circuits*

## 2.7 International Standardization Organization (ISO) Publications. 

> ISO-10012 *Measurement Management Systems -- Requirements for
> Measurement Processes and Measuring Equipment*

## 2.8 International Civil Aviation Organization (ICAO).

> Annex 14 *Volume 1, Aerodrome Design and Operation*s

## 2.9 Illuminating Engineering Society (IES).

> IES Handbook *Reference and Application Volume, 8th Edition, 1993,
> Flashing Light Signals, pp. 96-97*

Copies of FAA ACs may be obtained from:

> U.S. Department of Transportation\
> Subsequent Distribution\
> Office Ardmore East Business Center
>
> 3341 Q 75^th^ Ave.
>
> Landover, MD 20785
>
> Tel: (301) 322-4961
>
> FAX: (301) 386-5394
>
> Website: [www.faa.gov]{.underline}

Copies of military standards and specifications may be obtained from:

> DAPS/DODSSP
>
> Building 4, Section D
>
> 700 Robbins Avenue
>
> Philadelphia, PA 19111-5094
>
> Tel: (215) 697-2179
>
> FAX: (215) 697-1460
>
> Website: [dodssp.daps.dla.mil]{.underline}

Copies of IEEE standards may be obtained from:

> IEEE Customer Service Center
>
> 445 Hoes Lane
>
> P.O. Box 1331
>
> Piscataway, NJ 08855-1331
>
> Tel: (800) 678-4333

FAX: (732) 981-0060 *(Worldwide)*

> FAX: (732) 981-9667
>
> E-mail: <storehelp@ieee.org>
>
> Website: [shop.ieee.org/ieeestore]{.underline}

Copies of the ISO document are available online from:

> Website: [www.iso.ch]{.underline}

Copies of ICAO documents may be obtained from:

ICAO, Document Sales Unit

999 University Street

Montreal, Quebec, Canada H3C 5H7

Telephone: +1 (514) 954-8022

FAX: +1(514) 954-6769

E-mail: <sales@incao.int>

Website: www.icao.int

Copies of IES of North America (IESNA) documents may be obtained from:

> Website: [www.techstreet.com]{.underline}
>
> or
>
> Website: [www.iesna.org/shop/]{.underline}

**Intentionally left blank.**

# CHAPTER 3. EQUIPMENT REQUIREMENTS.

## 3.1 General.

This section addresses environmental, design, and photometric
requirements for obstruction light equipment. Criteria for selecting the
proper obstruction lighting equipment, installation tolerances, and
administrative information are in AC 70/7460-1, *Obstruction Marking and
Lighting.*

## 3.2 Environmental Requirements.

Obstruction lighting equipment must be designed for continuous operation
under the following conditions:

a.  Temperature. Storage/shipping: -67 degrees Fahrenheit (F) (-55
    degrees Celsius (C)) to 130 degrees F (55 degrees C). Operating: -40
    degrees F (-40 degrees C) to 130 degrees F (55 degrees C).

b.  Humidity. 95 percent relative humidity.

c.  Wind. Wind speeds up to 150 miles per hour (mph) (240 kilometeres
    per hour (kmph)).

d.  Wind-blown Rain. Exposure to wind-blown rain from any direction.

e.  Salt Fog. Exposure to salt-laden atmosphere.

f.  Sunshine. Exposure to solar radiation.

## 3.3 Design Requirements.

### 3.3.1 Light Unit.

The light unit must be lightweight and designed for easy servicing and
lamp (or flashtube) replacement. Materials used within the light unit
must be selected for compatibility with their environment. All plastic
lens parts (including gaskets), that are exposed to ultraviolet
radiation or ozone gas must not change color, crack, check,
disintegrate, or be otherwise degraded (photometry must remain
compliant) and meet the equipment warranty requirements of AC
150/5345-53, Appendix 2. Each light unit must be an independent unit and
must flash at the specified intensity or at its highest intensity when
control signals are absent.

### 3.3.2 Light Covers. 

Light-transmitting covers for light units must be per the requirements
in MIL-C-7989. In addition, if plastic covers are used, they must be
resistant to checking, crazing, or color changes caused by ultraviolet
radiation or ozone gas exposure.

### 3.3.3 Light Colors.

The aviation red must be per ICAO Annex 14, Volume 1, Appendix 1,
*Colours for Aeronautical Ground Lights,* at operating temperature
within the following chromaticity boundaries:

purple boundary y = 0.980 - x

yellow boundary y = 0.335

x + y + z = 1

Xenon flashtube emission or a color temperature range from 4,000 to
8,000 degrees Kelvin is acceptable for white obstruction lights. See
Engineering Brief #67 for additional information about lamp chromaticity
requirements.

#### 3.3.3.1 Light Color During Daytime.

Means must be provided on all L-810 obstruction lights to indicate the
specified non-powered color during daytime viewing. See Engineering
Brief #67 for additional information.

### 3.3.4 Aiming (for L-856 and L-857).

Light units must have a method for adjustment of the vertical aiming
angle between 0 and +8 degrees. A spirit level or other device must be
provided as part of each light unit for setting the vertical aiming
angle of the light beam with an accuracy of one degree.

### 3.3.5 Control Unit.

#### 3.3.5.1 Flashing White Obstruction Lighting Systems.

The control unit must set the system\'s flash rate, intensity and
sequence and must be capable of controlling light units up to a distance
of 2,500 feet (ft) (762 meters (m)). If the control unit or control
wiring fails, the light units must continue to flash per Table 4 flash
rate. Failure of an intensity step change circuit must cause all light
units to remain operating at their proper intensity or alternatively to
operate at the high intensity step.

##### 3.3.5.1.1 Monitoring.

Each light unit must be monitored for FLASH/FAIL status. FAIL status is
defined as either of the following conditions: unit misses four or more
consecutive flashes; unit flashes at wrong intensity step during day
operation. Monitoring must be fail safe (i.e., active signals for FLASH
and absence of signals for FAIL). There must be a provision to permit
connection to a remote alarm device, (supplied by others or as an
option), to indicate the system and individual light unit FLASH/FAIL
status.

**NOTE:** *See Engineering Brief #67 for additional information
regarding the failure requirements for multiple alternative lighting
devices (ALDs).*

##### 3.3.5.1.2 Placement.

The control and monitor functions may be consolidated in a light unit or
in a single enclosure for remote mounting or they may be distributed
into several light units.

###### 3.3.5.1.2.1 Remote Mounting.

In addition to the above, if placed in a remote mounted enclosure, the
control unit must display the status of each light unit. An intensity
control override switch must also be mounted in the enclosure to
manually control light intensity during maintenance or in the event of a
photoelectric control malfunction.

#### 3.3.5.2 Flashing Red Obstruction Lights.

The control unit must set the system flash rate and flash sequence.
Failure of the flashing circuit must cause the light units to energize
and operate as steady burning lights. An override switch must be mounted
on the control unit to manually control the lights during maintenance or
in the event of a lack of a photoelectric control signal. To insure
proper operation, all flashing red obstruction lights, inclusive of any
associated system steady burning red lights, must be certified with a
control unit whether internal or external to the lighting unit.

##### 3.3.5.2.1 Dual Lighting Systems. 

The control unit may be a separate unit or incorporated as part of
either the white or red obstruction light control unit. The control unit
must set the operating mode for each light unit in the system. Outage of
one of two lamps, or any failure in the device that causes a reduction
in intensity of the horizontal beam or results in an outage in the
uppermost red beacon (L-864 unit) or outage of any uppermost red strobe,
must cause the white obstruction light system to operate in its
specified \"night\" step intensity. At no time should both red and white
systems be on simultaneously. An override switch must be mounted on the
control unit to manually control the operating mode of the system during
maintenance or in the event of a lack of a photoelectric control signal.

##### 3.3.5.2.2 Monitoring.

Each separate L-864 light unit and each tier of L-810 light units must
be monitored for FLASH/FAIL status. FAIL is defined as outage of any
lamp in an L-864 light unit, outage of any one lamp in a tier of L-810
light units, or failure of a flasher (steady on and/or total) for an
L-864 light unit. Monitor signals must be fail safe (i.e., active
signals for FLASH and absence of signals for FAIL). There must be a
provision to permit connection to a remote alarm device, (supplied by
others or as an option) to indicate FLASH/FAIL status.

**NOTE:** *See Engineering Brief #67 for additional information
regarding the failure requirements for multiple alternative lighting
devices (ALDs).*

### 3.3.6 Input Voltage.

The obstruction lighting equipment must be designed to operate from the
specified input voltage ±10 percent. Incandescent lamps must be operated
to within ±3 percent of the rated lamp voltage to provide proper light
output.

### 3.3.7 Performance Criteria.

Manufacturers are required to publish performance criteria for all light
generating devices (see Engineering Brief #67).

### 3.3.8 Transient Protection.

Equipment with solid state devices must be designed to withstand and/or
include separate surge protection devices that are tested against
defined waveforms per IEEE C62.41-1991, Table 4, Location Category C1,
for single phase modes (line to ground, line to neutral, line and
neutral to ground).

### 3.3.9 Radiated Emissions. 

**NOTE:** *Optional only. No equipment qualification is required.*

a.  Obstruction lighting that uses electronic circuitry to power the
    light source must be classified as an incidental radiator (47 CFR
    §15.13). This applies to equipment that does not intentionally
    generate any radio frequency energy, but may create such energy as
    an incidental part of its intended operations.

b.  Obstruction light systems must employ sound engineering practices to
    minimize the risk of harmful interference.

### 3.3.10 Warning Labels.

All enclosures that contain voltages exceeding 150 volts direct current
(VDC) or alternating current (AC) root mean square (rms) must have high
voltage warning label(s) placed at a conspicuous location(s). Also, a
visual indicator must be included within the enclosure to indicate that
greater than 150 VDC is present on the high voltage capacitors.

### 3.3.11 Interlock Switches.

Interlock switches must be incorporated in each power supply and
optionally in each flashhead so that opening either unit must (1)
interrupt incoming power and (2) discharge all high voltage capacitors
within the enclosure to 50 volts or less within 30 seconds.

### 3.3.12 Nameplate. 

A nameplate, with the following information, must be permanently
attached to each unit:

a.  Name of unit (light unit, control unit, etc.).

b.  FAA type (e.g., L-856, L-864, etc.).

c.  Manufacturer\'s catalog number.

d.  Manufacturer\'s name and address.

e.  Rated separation distance in feet is \_\_\_\_ to \_\_\_\_\_ between
    power supply and optical head using American Wire Gage (AWG)
    \_\_\_\_ conductors. (Item e is required if a unique power supply
    and its associated optical head are separate components of the
    lighting system as in the case of some discharge lights.)

In addition to the above, the power supply must include nominal input
voltage, number of phases, frequency, and peak VA rating.

### 3.3.13 Optional Arctic Kit

Light systems may be offered with an optional arctic kit to enable
operation in temperatures below -40 degrees F (-40 degrees C).

### 3.3.14 Component Ratings.

#### 3.3.14.1 Discharge Type Lighting Equipment.

The flashtube or flashtubes must have a minimum rated life of two years
without maintenance or loss of light output below the minimum specified
candela.

##### 3.3.14.2 Component Separation Rating.

If the light unit\'s power supply and optical head are separate
components, the manufacturer must rate each light unit for maximum and
minimum separation at a given AWG wire size. The manufacturer must
include this rating on the nameplate per section 3.3.12. The rating
certifies that the unit meets all requirements within the rated
distances. The manufacturer must maintain records of test results which
support the stated separation rating until the next system
re-qualification.

##### 3.3.14.3 Incandescent Light Equipment.

Lamps must have a minimum rated life of 2,000 hours at rated voltage.

##### 3.3.14.4 Alternative Light Source Equipment. 

Light sources other than incandescent or xenon (light emitting diodes,
cold cathode) must have a minimum rated life of two years without
maintenance or loss of light output below the minimum specified
intensity (see Engineering Brief #67).

##### 3.3.14.5 Light Equipment Components.

All components used in obstruction lighting equipment, except lamps,
must be designed to meet performance requirements for a minimum of one
year without maintenance.

### 3.3.15 Leakage Current.

All obstruction lighting equipment classified in paragraph 1.2 must be
designed to withstand application of 1,000 volts AC or 1,414 volts DC
between the input power leads and equipment chassis for 10 seconds
during which the leakage current must not exceed 10 microamperes at
ambient room temperature and humidity.

## 3.4 Performance Requirements.

### 3.4.1 Photometric. 

#### 3.4.1.1 General.

The effective intensity for flashing lights must be calculated per the
following formula by the method described for *Flashing Light Signals*
in the IES Handbook, 1993 Reference and Application Volume 8th Edition,
Pages 96 and 97:

> $$I_{e} = \left( \int_{t_{1}}^{t_{2}}\text{Idt} \right)\left( 0\text{.}2 + \left( t_{2} - t_{1} \right) \right)$$
>
> Where:
>
> *I~e~* = Effective intensity (Candela)
>
> *I* = Instantaneous intensity (Candela)
>
> *t1 , t2* ***=*** Times in seconds of the beginning and end of that
> part of the flash when the value of *I* exceeds *I~e~*. This choice of
> the times maximizes the value of *I~e~*.

For discharge type flashing lights, the equipment must provide the
specified light output at the specified temperature extremes as the
input voltage simultaneously varies by ±10 percent from nominal. The
light intensity and beam distribution requirements for obstruction
lighting equipment are specified below. All intensities listed are
effective intensities (except steady-burning red obstruction lights)
measured at the flash rate specified in Table 4. All incandescent lights
will be tested as steady burning lights. Additional requirements for
ALDs are in Engineering Brief #67.

The effective intensity for multiple pulse flashes as used in strobe
lights during nighttime operation must be calculated by:

> $$I_{e} = \left( \frac{\int_{t_{1}}^{t_{A}}\text{Idt}}{0\text{.}2 + t_{A} - t_{1}} \right) + \left( \frac{\int_{t_{B}}^{t_{C}}\text{Idt}}{0\text{.}2 + t_{C} - t_{B}} \right) + \left( \frac{\int_{t_{D}}^{t_{E}}\text{Idt}}{0\text{.}2 + t_{E} - t_{D}} \right) + \text{.}\text{.}\text{.} + \left( \frac{\int_{t_{X}}^{t_{z}}\text{Idt}}{0\text{.}2 + t_{Z} - t_{X}} \right)$$

The frequency of the pulses must not be less than 50 Hz and the interval
t~A~- t~1~ must not vary by more than ±5% from the nominal value from
pulse to pulse over the simultaneous extremes of temperature and input
voltage.

#### 3.4.1.2 L-810 Light Unit.

The center of the vertical beam spread must be between +4 and +20
degrees. With a minimum vertical beam spread of 10 degrees and at all
radials throughout 360 degrees, there must be a minimum intensity of
32.5 candela. Mechanical interface for installation must be 3/4 or 1
inch National Pipe Thread (NPT) side and/or bottom.

#### 3.4.1.3 L-856 Light Unit.

The beam spread and effective intensity must be per Table 1.

[]{#__RefHeading___Toc145824397 .anchor}Table 1. L-856 Intensity
Requirements.

+--------------+-------------------+----------------+------------------+
| **Step**     | **Beam Spread**   |                | **Peak           |
|              |                   |                | Intensity**      |
|              |                   |                |                  |
|              |                   |                | **(candela)      |
|              |                   |                | ^(2)^**          |
+--------------+-------------------+----------------+------------------+
|              | **Horizontal      | **Vertical**   |                  |
|              | ^(1)^**           |                |                  |
|              |                   | **(degrees)**  |                  |
|              | **(degrees)**     |                |                  |
+--------------+-------------------+----------------+------------------+
| Day          | 90 or 120         | 3 - 7          | 270,000 ±25%     |
|              |                   |                |                  |
| Twilight     | 90 or 120         | 3 - 7          | 20,000 ±25%      |
|              |                   |                |                  |
| Night        | 90 or 120         | 3 - 7          | 2,000 ±25%       |
+--------------+-------------------+----------------+------------------+

**NOTES:**

> *(1) Multiple light units may be used to achieve a horizontal coverage
> of 360 degrees.*
>
> *(2) When the light unit is installed per the manufacturer\'s
> instructions, the intensity at zero degrees elevation angle
> (horizontal) must be at least as great as the minimum specified beam
> peak intensity. For stray light, the intensity at 10 degrees below
> horizontal, at any radial, must not be greater than 3% of the peak
> intensity at the same radial.*

#### 3.4.1.4 L-857 Light Unit.

Photometric requirements are defined in Table 2.

[]{#__RefHeading___Toc145824398 .anchor}Table 2. L-857 Intensity
Requirements.

+-------------+------------------+-------------+---------------------+
| **Step**    | **Beam Spread**  |             | **Peak Intensity**  |
|             |                  |             |                     |
|             |                  |             | **(candela)^(2)^**  |
+-------------+------------------+-------------+---------------------+
|             | **Horizontal**   | *           |                     |
|             |                  | *Vertical** |                     |
|             | **(degrees)      |             |                     |
|             | ^(1)^**          | **          |                     |
|             |                  | (degrees)** |                     |
+-------------+------------------+-------------+---------------------+
| Day         | 90 or 120        | 3 - 7       | 140,000 ±25%        |
|             |                  |             |                     |
| Twilight    | 90 or 120        | 3 - 7       | 20,000 ±25%         |
|             |                  |             |                     |
| Night       | 90 or 120        | 3 - 7       | 2,000 ±25%          |
+-------------+------------------+-------------+---------------------+

**NOTES:**

> *(1) Multiple light units may be used to achieve a horizontal coverage
> of 360 degrees.*
>
> *(2) When the light unit is installed per the manufacturer\'s
> instructions, the intensity at zero degrees elevation angle
> (horizontal) must be at least as great as the minimum specified beam
> peak intensity. For stray light, the intensity at 10 degrees below
> horizontal, at any radial, must not be greater than 3% of the peak
> intensity at the same radial.*

#### 3.4.1.5 L-864 Light Unit.

At all radials throughout the omnidirectional 360 degrees, there must be
a peak effective intensity of 2,000 ±25 percent candela. There must also
be a minimum effective intensity of 750 candela throughout a minimum
vertical beam spread of 3 degrees.

##### 3.4.1.5.1 Beam Adjustment.

When the light unit is installed per the manufacturer\'s instructions,
the intensity at zero degrees elevation angle (horizontal) must be at
least as great as the minimum specified beam peak intensity.

#### 3.4.1.6 L-865 Light Unit.

Photometric requirements are defined in Table 3.

[]{#__RefHeading___Toc145824399 .anchor}Table 3. L-865 Intensity
Requirements.

+---------------+----------------+---------------+-------------------+
| **Step**      | **Beam         |               | **Peak            |
|               | Spread**       |               | Intensity**       |
|               |                |               |                   |
|               |                |               | *                 |
|               |                |               | *(candela)^(2)^** |
+---------------+----------------+---------------+-------------------+
|               | **Horizontal** | **Vertical**  |                   |
|               |                |               |                   |
|               | **(degrees)    | **(degrees)** |                   |
|               | ^(1)^**        |               |                   |
+---------------+----------------+---------------+-------------------+
| Day/Twilight  | 360            | 3 minimum     | 20,000 ±25%       |
|               |                |               |                   |
| Night         | 360            | 3 minimum     | 2,000 ±25%        |
+---------------+----------------+---------------+-------------------+

**NOTES:**

> *(1) Multiple light units may be used to achieve a horizontal coverage
> of 360 degrees.*
>
> *(2) When the light unit is installed per the manufacturer\'s
> instructions, the intensity at zero degrees elevation angle
> (horizontal) must be at least as great as the minimum specified beam
> peak intensity. For stray light, the intensity at 10 degrees below
> horizontal, at any radial, must not be greater than 3% of the peak
> intensity at the same radial.*

#### 3.4.1.7 L-866 Light Unit.

The requirements are the same as the L-865 light unit, except the flash
rate must be 60 flashes per minute (FPM).

#### 3.4.1.8 L-885 Light Unit.

The requirements are the same as the L-864 light unit, except the flash
rate must be 60 FPM.

### 3.4.2 Flash Rate and Duration.

Flash characteristics are defined in Table 4.

[]{#__RefHeading___Toc145824400 .anchor}Table 4. Flash Characteristics
for Obstruction Lights

  ---------- ------------- ----------- ---------------------------------------
  **Type**   **Intensity   **Flash     **Flash Duration ^(2)^**
             Step**        Rate        
                           ^(1)^**     

  L-856      Day &         40 FPM      Less than 100 milliseconds (ms)
             Twilight                  

  L-856      Night         40 FPM      Between 100 and 250 ms inclusive

  L-857      Day &         60 FPM      Less than 100 ms
             Twilight                  

  L-857      Night         60 FPM      Between 100 and 250 ms inclusive

  L-864      Single        20-40 FPM   1/2 to 2/3 of flash period if
                                       incandescent lighting **^(3)^**, and
                                       between 100 and 2000 ms inclusive if
                                       other lighting sources.

  L-865      Day &         40 FPM      Less than 100 ms
             Twilight                  

  L-865      Night         40 FPM      Between 100 and 1000 ms inclusive

  L-866      Day &         60 FPM      Less than 100 ms
             Twilight                  

  L-866      Night         60-FPM      Between 100 and 250 ms inclusive

  L-885      Single        60 FPM      1/2 to 2/3 of flash period if
                                       incandescent lighting **^(3)^**, and
                                       between 100 and 670 ms inclusive if
                                       other lighting sources.
  ---------- ------------- ----------- ---------------------------------------

**NOTES:**

> *(1) Flash rates have a tolerance of ±5 percent.*
>
> *(2) When the effective flash duration is achieved by a group of short
> flashes, the short flashes must be emitted at a rate of not less than
> 50 Hz.*
>
> *(3) The light intensity during the \"off\" period must be less than
> 10 percent of the peak effective intensity. The \"off\" period must be
> at least 1/3 of the flash period.*

### 3.4.3 System Flashing Requirements.

#### 3.4.3.1 Simultaneous Flashing Systems.

All obstruction lights in systems composed of either L-864 light units
or L-856 and/or L-865 light units must flash within 1/60 of a second of
each other.

#### 3.4.3.2 Sequenced Flashing Systems.

a\. Catenary support structure systems composed of L-857, L-866, or
L-885 light units must have a sequenced flashing characteristic.

b\. This system consists of three lighting levels on or near each
supporting structure. One light level is near the top, one at the bottom
or lowest point of the catenary, and one midway between the top and
bottom.

c\. The flash sequence must be middle, top, and bottom.

d\. The interval between top and bottom flashes must be about twice the
interval between middle and top flashes.

e\. The interval between the end of one sequence and the beginning of
the next must be about 10 times the interval between middle and top
flashes.

f\. The time for the completion of one cycle must be one second (±5
percent).

### 3.4.4 Intensity Step Changing.

#### 3.4.4.1 White Obstruction Lights.

The light unit intensity must be controlled by a photocell facing the
northern (polar) sky. White obstruction lights must automatically change
intensity steps when the ambient light changes as follows:

a\. From day intensity to twilight intensity when the illumination
decreases below 60 foot-candles (645.8 lux) but before it reaches 35
foot-candles (376.7 lux).

b\. From twilight intensity to night intensity when the illumination
decreases below 5 foot-candles (53.8 lux) but before it reaches 2
foot-candles (21.5 lux).

c\. From night intensity to twilight intensity when the illumination
increases above 2 foot-candles (21.5 lux) but before it reaches 5
foot-candles (53.8 lux).

d\. From twilight intensity to day intensity when the illumination
increases above 35 foot-candles (376.7 lux) but before it reaches 60
foot-candles (645.8 lux).

#### 3.4.4.2 Red Obstruction Lights.

If automatic control is utilized, the light unit must turn on when the
ambient light decreases to not less than 35 foot-candles (367.7 lux) and
turn off when the ambient light increases to not more than 60
foot-candles (645.8 lux). Single L-810 light units are controlled in a
manner compatible with the particular installation.

#### 3.4.4.3 Dual Obstruction Lighting System.

White obstruction lights must turn off and red obstruction lights must
turn on when the ambient light changes from twilight to night per
paragraph 3.4.4.1b. Red obstruction lights must turn off and white
obstruction lights must turn on when the ambient light changes from
night to twilight per paragraph 3.4.4.1c.

## 3.5 Instruction Manual.

An instruction manual containing the following information must be
furnished with all obstruction lighting equipment:

a.  Complete system schematic and wiring diagrams showing all components
    cross-indexed to the parts list.

b.  Complete parts list of field replaceable parts with applicable
    rating and characteristics of each part, and with the component
    manufacturer\'s part number as appropriate.

c.  Installation instructions, including leveling and aiming of light
    units.

d.  Maintenance instructions, including lamp or flashtube replacement,
    theory of operation, troubleshooting charts and, as appropriate,
    conspicuous warnings about alignment and replacement of lamps and
    light units with other than manufacturer recommended items.
    Explanation of testing requirements regarding light units with
    specific lamps must be provided in the text. A discussion must be
    included about mixing light units as replacements with other
    manufacturers' units with emphasis on assuring that system design of
    obstruction lighting is not degraded.

e.  Operating instructions.

**Intentionally left blank.**

# CHAPTER 4. EQUIPMENT QUALIFICATION REQUIREMENTS.

## 4.1 Qualification Procedures.

Procedures for qualifying equipment to be furnished under the Federal
grant assistance program for airports are contained in AC 150/5345-53,
*Airport Lighting Equipment Certification Program.*

## 4.2 Qualification Tests.

Qualification tests must be conducted on the light unit in the following
order:

a.  Initial photometric test, per paragraph 4.2.1

b.  Environmental tests, per paragraphs 4.2.2, 4.2.3, 4.2.4, 4.2.5,
    4.2.6, 4.2.7, and 4.2.8 (in any order)

c.  1000 hours of continuous operation, per paragraph 4.2.10

d.  System Operational Test, per paragraph 4.2.10

e.  Leakage Current Test, per paragraph 4.2.11

f.  Sampling Photometric Test, per paragraph 4.2.1

g.  Visual examination, per paragraph 4.2.12

h.  Transient Protection Test, per paragraph 4.2.9. The equipment may be
    damaged by this test. It should only be performed when testing per
    paragraphs a though c above is complete.

Sample photometric and system operational tests must be conducted after
completion of all environmental tests. The same unit(s) must be used
throughout the tests. The following tests are required to demonstrate
compliance with this specification. The tests may be run on the control
unit, power supply, and a single light unit, with a simulated load
replacing the other light units. Equipment tested must be as a complete
system.

### 4.2.1 Photometric Test.

a.  A full photometric test as described in this section must be
    performed before all environmental tests.

**NOTE:** *To verify proper color correction, photometric testing
conducted on alternative light source fixtures must be done with a
detector having an up to date calibration including spectral response
data (see Engineering Brief #67).*

b.  A sampling photometric retest must be conducted after the unit has
    been operated continuously for 1000 hours with normal (12 hour)
    day/night cycling. This sampling must consist of measuring the
    vertical beam pattern for compliance with photometric requirements
    at a minimum of two of the previously tested horizontal radials.

c.  Light units must be energized by the system power supply and control
    unit, and must be tested for compliance with photometric
    requirements.

d.  For alternative light source equipment high temperature testing, see
    Engineering Brief #67.

e.  Incandescent lamps must be tested at ±3 percent of their nominal
    voltage.

f.  Red light intensity may be measured in white light and then
    calculated if the glassware manufacturer certifies the chromaticity
    and transmissivity values of the red filter material for the
    particular source.

g.  If more than one lamp type is to be used, the qualification testing
    must be completed for each lamp type.

h.  For a discharge type flashing system, if the power supply and
    optical head are separate components, the manufacturer must
    demonstrate that the required photometrics are produced with the
    units separated by maximum and minimum recommended distances and
    connected by cable recommended by the manufacturer.

i.  Photometric test results must be in the forms of:

    1.  Vertical beam pattern: Distribution curve (vertical angle versus
        candela) with minimum one degree spacing of test points over
        range of specified angles.

    2.  Horizontal beam pattern: Polar plot (horizontal angle versus
        candela) with minimum 30 degree spacing of test points.

### 4.2.2 High Temperature Test.

a.  The high temperature test must be conducted per MIL-STD-810F, Method
    501.4, Procedure II. The equipment must be subjected to a constant
    temperature of +130 degrees F (+55 degrees C) for 4 hours after
    equipment temperature stabilization and be operated throughout the
    test.

**NOTE:** *For steady state temperature testing, consider thermal
stabilization to be achieved when the temperatures of critical internal
operating components are relatively constant. (Because of test item duty
cycling or the operating characteristics, a constant temperature may
never be achieved.)*

b.  During the test, the manufacturer must demonstrate that the
    equipment maintains the specified flash rate and (for discharge type
    flashing light) the proper amount of energy is being delivered to
    the flashtube as the input voltage is varied by ±10 percent from
    nominal.

c.  A visual examination must be conducted after the equipment is
    removed from the chamber. Failure of the equipment to operate as
    specified is cause for rejection.

### 4.2.3 Low Temperature Test.

a.  The low temperature test must be conducted per MIL-STD-810F, Method
    502.4, Procedure II. The equipment must be placed in a chamber that
    maintains a temperature of -67 degrees F (-55 degrees C) for
    shipping/storage requirements and -40 degrees F (-40 degrees C) for
    equipment operational requirements.

b.  Equipment operation must be demonstrated at the beginning of the
    test.

c.  The equipment storage and shipping low temperature requirement is
    -67 degrees F (-55 degrees C). The equipment must be stabilized and
    cold soaked at the storage/shipping temperature for one hour. The
    test chamber must then be ramped to the -40 degree F (-4 degrees C)
    equipment operating temperature at no more than 6 degrees F (3
    degrees C) per minute to prevent thermal shock to the equipment.

d.  The equipment, with input power off, must then be exposed to a
    24-hour soaking period at -40 degrees F (-40 degrees C) after which
    the equipment must be turned on for one hour, and must operate
    normally. For discharge type flashing lights, the unit must achieve
    specified flash rate and intensity within 1 minute after being
    energized. During the one hour of operation, the manufacturer must
    demonstrate that the equipment maintains the specified flash rate
    and, for discharge type flashing lights, the proper amount of energy
    is being delivered to the flashtube as the input voltage is varied
    by ±10 percent from nominal.

e.  At the conclusion of the test, a visual inspection must be
    conducted. Failure of the equipment to operate as specified is cause
    for rejection.

### 4.2.4 Rain Test.

The wind-blown rain test must be conducted per MIL-STD-810F, Method
506.4, Procedure I, paragraph 4.4.2. The rain must be at a rate of 5.2
inches per hour (132 mm/hour) with an exposure time of 30 minutes per
side. The equipment must be operated throughout the test. Failure of the
equipment to operate as specified is cause for rejection.

### 4.2.5 Wind Test.

Evidence must be provided, either by testing or by calculation of
mechanical force, to demonstrate that installed light units meet the
wind requirement in paragraph 3.2c.

### 4.2.6 Humidity Test.

The test must be per MIL-STD-810F, Method 507.4, Procedure, paragraph
4.5.2. The equipment must be subjected to two complete cycles per Table
507.4-1, except the maximum chamber temperature must be +130 degrees F
(+55 degrees C). Failure of the equipment to operate as specified is
cause for rejection.

### 4.2.7 Salt Fog Test.

The salt fog test must be conducted per MIL-STD-810F, Method 509.4,
Procedure, paragraph 4.5.2. Failure of the equipment to operate as
specified is cause for rejection. If corrosion is present, the third
party certification body must determine if it has impacted equipment
structural integrity or functionality.

### 4.2.8 Sunshine Test.

**NOTE:** *The manufacturer may submit a certificate of compliance (for
consideration by the third party certification body) from the
material(s) manufacturer attesting to UV resistance (per MIL-STD-810F)
in lieu of the testing requirements below.*

The equipment must be in its normal operational configuration for this
test.

a.  A sunshine test must be conducted per MIL-STD-810, Method 505.4,
    paragraph 4.4.3, Procedure II for all obstruction lighting equipment
    with nonmetallic exterior parts or plastic/thermoplastic light
    covers.

b.  The equipment must be subjected to a minimum of 56 cycles.

c.  Perform an operational test of the equipment after 56 cycles.

d.  Any evidence of deterioration of plastic parts: chalking, bleaching,
    cracking, hazing, or color changes (yellowing) to the thermoplastic
    lenses of the test unit must be causes for rejection.

e.  For plastic/thermoplastic optical lenses or covers, the photometric
    performance must be measured after this test.

### 4.2.9 Transient Protection Test.

**NOTE:** *The equipment may be damaged by this test. Perform this test
only when tests in paragraphs 4.2.1 through 4.2.8 are completed.*

a.  Subject the obstruction lighting equipment to 2 pulses at 15 second
    intervals to a combination wave 1.2 microseconds (µs)/50µs and
    8µs/20µs (6,000 volts, 3,000 amps) test pulse per the descriptions
    in IEEE C62.41, Table 4, Location Category C1.

b.  See IEEE C62.41-1991 Section 9.3 for test condition and test
    generator information.

c.  See IEEE C62.41-1991 Section 9.4 for a detailed combination pulse
    generation and parameters discussion.

d.  See also IEEE C62.45, *IEEE Recommended Practice on Surge Testing
    for Equipment Connected to Low-Voltage (1,000 volts (V) and Less) AC
    Power Circuits* for guidance about equipment test methods.

e.  The equipment under test must operate normally at the conclusion of
    the test.

### 4.2.10 System Operational Test.

a.  A system operational test must be performed after the unit has been
    operated continuously without failure for 1000 hours with normal (12
    hour) day/night cycling.

b.  System components must be connected with the necessary wiring to
    electrically simulate an actual installation in which the top and
    bottom light units on a structure are separated by 2,000 feet
    (609.6 m) for a system composed of L-856 and/or L-865 and 500 feet
    (152.4 m) for system composed of L‑857 or L-866, and the controller
    separated an additional 2,500 feet (762.0 m). Simulated
    interconnecting cables with equivalent impedance may be used in lieu
    of full cable lengths.

c.  The system must be energized and operated to demonstrate compliance
    with all specification operating requirements such as flash rate,
    flash sequence, photoelectric switching of intensity steps,
    operation of interlocked devices, and satisfactory operation under
    input voltage variations.

d.  If the power supply and optical head are separate components, it
    must be demonstrated that with the maximum and minimum nameplate
    rated separation between components, proper energy is delivered to
    the light unit to produce the specified photometrics.

e.  It must be demonstrated that L-810 and L-864 lights produce the
    specified photometric requirement when energized over conductors
    (actual or simulated) representing the maximum and minimum nameplate
    rated cable length at the minimum input voltage.

### 4.2.11 Leakage Current Test.

Light units must be tested for compliance to the leakage current
requirement in paragraph 3.3.15. Leakage current must be measured
between the primary power connection points to the equipment chassis.
The primary power connection points may be connected together during
this test, but all other internal wiring must be connected as in normal
operation. Devices for surge and lightning protection connected directly
to input power wiring may be disconnected during this test.

### 4.2.12 Visual Examination.

The obstruction lighting equipment must be examined for compliance with
the requirements on materials, finish, and quality of workmanship.

**Intentionally left blank.**

# CHAPTER 5. PRODUCTION TEST REQUIREMENTS.

## 5.1 System Production Tests.

A visual examination must be performed for all components in a system to
verify proper materials and assembly. Each component of the system must
be energized and tested to verify specified operation and conformance to
photometric requirements.

## 5.2 Incandescent Light Unit Production Tests.

All light units must be visually examined for proper materials and
assembly. The manufacturer must demonstrate that the on-going production
photometric test results show the manufacturing process meets the
photometric requirements per paragraphs 3.4.1.2, 3.4.1.5, or 3.4.1.8 and
per section 5.6.

## 5.3 Alternative Lighting Devices (ALD). 

All light units must be visually examined for proper materials and
assembly. The manufacturer must demonstrate that the ongoing production
photometric test results show the manufacturing process meets the
photometric requirements per paragraphs 3.4.1.2 through 3.4.1.8 and per
section 5.6.

## 5.4 Discharge Light Unit Production Test.

All light units must be visually examined for proper materials and
assembly. The units must be energized and tested to verify proper
operation and conformance to photometric requirements as specified in
Tables 5 and 6.

## 5.5 Production Operational Test.

All light units must be tested to verify specified operation per the
following minimum standards.

a.  Each unit must be operated a minimum of 24 hours at highest
    intensity and a minimum of 12 hours at lowest intensity.

b.  During highest intensity operation, each unit must be monitored for
    FLASH/FAIL as defined in 3.3.5.1.1. Minimum acceptable quality is
    zero FAILs in 24 hours of high intensity operation.

c.  After a minimum 36 hours elapsed time of operation each light unit
    must be tested to verify proper operation of the following:

```{=html}
<!-- -->
```
(1) All intensity step changes per paragraph 3.4.4.1

(2) Proper operation of monitoring per paragraph 3.3.5.1.1

(3) Proper interlock switch operation and discharge time to 50 volts
    (bank potential) per paragraph 3.3.11.

(4) Simultaneous flashing and intensity changing for multi-light systems
    per paragraphs 3.4.3.1 and 3.3.5.1, respectively

(5) Leakage current test per paragraph 3.3.15.

## 5.6 Production Photometric Test.

Photometric testing must be performed per Table 5 or Table 6 using
either conventional sampling per column 2 or statistical process control
(SPC) per column 3. If SPC is used for a characteristic, it must show
statistical capability with Cpk ≥ 1.0 and σ ≥ 3.0.

[]{#__RefHeading___Toc145824401 .anchor}Table 5. L-856/L-857 Production
Photometric Requirements.

+-------------------+-----------------------------+--------------------+
| *                 | **TEST POINTS**             |                    |
| *CHARACTERISTIC** |                             |                    |
|                   |                             |                    |
| **TESTED ^(1)^**  |                             |                    |
+-------------------+-----------------------------+--------------------+
|                   | **CONVENTIONAL**            | **SPC**            |
+-------------------+-----------------------------+--------------------+
| a\) Beam peak     | 3 radials each unit:        | 1 radial each      |
|                   |                             | unit, random       |
| (Day Intensity)   | 1 at center of Horizontal   | orientation        |
|                   | beam +2 radials ±45 degrees |                    |
|                   | or ±60 degrees from center  |                    |
+-------------------+-----------------------------+--------------------+
| b\) Beam peak     | Same radials as (a)         | Same radials as    |
|                   |                             | (a)                |
| (Twilight         |                             |                    |
| Intensity)        |                             |                    |
+-------------------+-----------------------------+--------------------+
| c\) Beam peak     | Same radials as (a)         | Same radials as    |
|                   |                             | (a)                |
| (Night Intensity) |                             |                    |
+-------------------+-----------------------------+--------------------+
| d\) Intensity at  | Same radials as (a)         | Same radials as    |
| -10 degrees       |                             | (a)                |
|                   |                             |                    |
| (Night)           |                             |                    |
+-------------------+-----------------------------+--------------------+

**NOTES:**

*(1) Characteristic must meet all specifications per paragraph 3.4.1.3
or 3.4.1.4.*

[]{#__RefHeading___Toc145824402 .anchor}Table 6. L-865/866/864^(1)^
/885^(1)^ Production Photometric Requirements.

+--------------------+---------------------------+--------------------+
| **CHARACTERISTIC** | **TEST POINTS**           |                    |
|                    |                           |                    |
| **TESTED ^(2,3)^** |                           |                    |
+--------------------+---------------------------+--------------------+
|                    | **CONVENTIONAL**          | **SPC**            |
+--------------------+---------------------------+--------------------+
| a\) Beam peak      | 4 radials each unit:      | 1 radial each      |
|                    |                           | unit, random       |
| (Day Intensity)    | equally spaced, random    | orientation        |
|                    | orientation               |                    |
+--------------------+---------------------------+--------------------+
| b\) Beam peak      | Same radials as (a)       | Same radials as    |
|                    |                           | (a)                |
| (Night Intensity)  |                           |                    |
+--------------------+---------------------------+--------------------+
| c\) Intensity at   | Same radials as (a)       | Same radials as    |
| -10 degrees        |                           | (a)                |
+--------------------+---------------------------+--------------------+

**NOTES:**

*(1) Discharge type and alternative light source light only.*

*(2) Characteristic must meet all specifications per paragraph 3.4.1.5
or 3.4.1.6.*

*(3) Day, night, and -10 degrees where applicable.*

## 5.7 Production Test Records.

Records showing actual test results of all tests required by paragraph
5.5 must be maintained for a period of three years by the manufacturer.
These records must be traceable to the units tested and in the case of
discharge light units traceable by serial number.

## 5.8 Production Test Equipment.

All measuring and test equipment used in the production of obstruction
lighting equipment classified under paragraph 1.2 must have its accuracy
and precision maintained by a calibration program with traceability to
ISO-10012 *Measurement Management Systems -- Requirements for
Measurement Processes and Measuring Equipment* or current industry
accreditation criteria. The manufacturer must show that all production
photometric testing equipment correlates to the certifying laboratory\'s
equipment to within ±5 percent. Photometric testing must be performed in
a properly designed photometric range using a calibrated photometer. For
discharge type flashing lights, all photometric measurements must be
based on a minimum five flash average.

**Intentionally left blank.**