SECTION 6

MAINTENANCE PROCEDURES

[6.1 INTRODUCTION]{.underline}.- This section contains the procedures
necessary to accomplish the performance checks specified in sections 4
and 5. Procedures for other maintenance tasks specified in section 5 are
also included in this section. If the results of any tests are not
within the required limits as specified, refer to the corrective
maintenance procedures in section 7.

2.  [PERFORMANCE CHECK]{.underline}.- The performance checks that follow
    shall be accomplished on all data points of all equipment being
    monitored on a periodic basis as specified in tables 5-1 and 5-2 of
    this instruction book. Each performance test contains all neces­sary
    instructions and may be performed independently of any other test.
    Certain tests described in this section will require the presence
    and assistance of a second person. In addition, test outputs may be
    monitored remotely at a designated remote maintenance console.

**CAUTION**

> Site personnel may, by normal work actions, cause unexpected test
> results. It is therefore necessary to coordinate the tests with site
> personnel, remote maintenance personnel, and air route traffic control
> center (ARTCC) personnel.

[6.2.1 Test Equipment]{.underline}.- None.

[6.2.2 Procedure]{.underline}.- The procedures provide instructions for
testing and evaluating the performance of the RMC.

[6.2.2.1 ATCBI-6 Checks]{.underline}.-

[6.2.2.1.1 ATCBI-6 Status Readings]{.underline}.- Verify that the
following RMC status readings agree with the settings of the ATCBI-6. Be
sure to change the configuration of the ATCBI-6 to both possible
settings where possible and confirm that the RMC acknowledges the
changes.

a\. ATCBI channel on-line A/B

b\. ATCBI channel A Operate/Maintenance

c\. ATCBI channel B Operate/Maintenance

[6.2.2.1.2 ATCBI-6 Command Outputs]{.underline}.- Use the RMC to enable
each of the following commands. Verify that the command has actually
made a change in the status of the ATCBI-6.

**CAUTION**

> Performing the following tests will cause an interruption in
> processing of beacon targets. Coordinate testing with supervisory
> personnel at the air traffic center.

a\. Select ATCBI Channel A

b.  Select ATCBI Channel B

    3.  [Power Check]{.underline}.-

6.2.2.1.3.1 Select the ATCBI-6 channel to be tested as the on-line
channel.

6.2.2.1.3.2 Verify that the power indicated by the ATCBI-6 local
maintenance terminal (LMT) for the transmitted pulses is the same as
that indicated on the RMC maintenance data terminal (MDT). Both should
be in accordance with the site commissioning values and the equipment
handbook. Verify the power for the following:

a\. directional power

b\. omni-directional power

c\. reverse directional power

[6.2.2.1.4 Receiver Tangential Sensitivity Check]{.underline}.-

6.2.2.1.4.1 Select the ATCBI-6 channel to be tested as the on-line
channel.

6.2.2.1.4.2 Verify that the receiver tangential sensitivity indicated by
the ATCBI-6 LMT is the same as that indicated on the MDT. Both should be
in accordance with the site commissioning values and the equipment
handbook.

[6.2.2.2 Azimuth Data Unit (ADU) Checks]{.underline}.-

[6.2.2.2.1 ADU Status Readings]{.underline}.- Verify that the following
RMC status readings agree with the settings of the ADU. Be sure to
change the configuration of the ADU to both possible channel settings
and confirm that the RMC acknowledges the changes.

a\. ADU channel 1 selected

b\. ADU channel 2 selected

[6.2.2.2.2 ADU Alarms]{.underline}.- Verify that the following RMC
Alarms agree with the settings of the ADU. Be sure to change the
configuration of the ADU and confirm that the RMC acknowledges the
changes.

**CAUTION**

> In order to create some of the following Alarms it is necessary to
> turn the antenna drive motors off. This will cause a loss of ra­dar
> targets. Coordinate testing with supervisory personnel at the air
> traffic center.

a\. Low oil level alarm

b\. Motor A alarm

c\. Motor B alarm

d\. Channel 1 late ARP

e\. Channel 1 ACP spacing

f\. Channel 2 late ARP

g\. Channel 2 ACP spacing

[6.2.2.2.3 ADU Power Supplies]{.underline}.-

6.2.2.2.3.1 Use a digital voltmeter to measure the following ADU power
supply voltages:

RMC Interface Terminal Block in ADU

Voltage to be measured ADU 10A1 TB3

a\. Supply 1 + 5 V dc 1

b\. Supply 1 +15 V dc 2

c\. Supply 1 --15 V dc 3

d\. Supply 2 + 5 V dc 4

e\. Supply 2 +15 V dc 5

f\. Supply 2 --15 V dc 6

g\. Supply 3 + 5 V dc 7

h\. Supply 3 +15 V dc 8

i\. Supply 3 --15 V dc 9

ADU voltage common 10

6.2.2.2.3.2 Verify that the measured values agree with the ADU power
supply readings as indicated on the MDT.

6.2.2.2.3.3 If any power supply reading indicated on the RMC varies from
the measured readings by more than the specified tolerance, then
recalibrate the RMC.

[6.2.2.3 FPS Checks]{.underline}.-

[6.2.2.3.1 FPS Status Readings]{.underline}.- Verify that the following
RMC status readings agree with the settings of the FPS primary radar. Be
sure to change the configuration of the FPS where possible and confirm
that the RMC acknowledges the changes. Some parameters such as LP/CP are
to be checked only at the discretion of the site personnel.

a\. Channel A STC 1

b.  Channel A STC 2

c\. Channel B STC 1

d\. Channel B STC 2

e\. SSR Alarm

f\. On-line MTI Video Ch A

g\. On-line MTI Video Ch B

h\. MTI Diplex Video On

i\. Video Ch A Available

j\. Video Ch B Available

k\. Polarization LP/CP (perform at the discretion of site personnel)

l\. Auto Fault Reset Unit (AFRU) Ch A Alarm

m\. AFRU Ch B Alarm

[6.2.2.3.2 FPS Command Outputs]{.underline}.- Use the RMC to enable each
of the following commands. Verify that the command has actually made a
change in the status of the FPS.

**CAUTION**

> Performing the following tests will cause an interruption in
> processing of beacon targets. Coordinate testing with supervisory
> personnel at the air traffic center.

a\. Channel A STC 1

b\. Channel A STC 2

c\. Channel B STC 1

d\. Channel B STC 2

e\. SSR Alarm Clear

f\. Diplex Video Select

g\. Simplex A Video Ch Select

h\. Simplex B Video Ch Select

i\. Simplex A / Diplex Select

j\. Simplex B Select

k\. Polarization LP/CP (perform at the discretion of site personnel)

4.  [ARSR-1/2 Checks]{.underline}.-

[6.2.2.4.1 ARSR-1/2 Status Readings]{.underline}.- Verify that the
following RMC status readings agree with the settings of the ARSR-1/2.
Be sure to change the configuration of the ARSR-1/2 to different
possible settings where possible and confirm that the RMC acknowledges
the changes.

a\. On-line ARSR Radar Channel

b\. Channel A STC 1

c\. Channel A STC 2

d\. Channel B STC 1

e\. Channel B STC 2

f\. SSR Alarm

g\. Radar Ch A Available

h\. Radar Ch B Available

i\. Radar Ch A Amplitron Alarm

j\. Radar Ch A Amplitron Power Supply (APS) pump on/off

k\. Radar Ch B Amplitron Alarm

l\. Radar Ch B APS pump on/off

m\. Polarization LP/CP (perform at discretion of site personnel)

[6.2.2.4.2 ARSR-1/2 Command Outputs]{.underline}.- Use the RMC to enable
each of the following commands. Verify that the command has actually
made a change in the status of the CD-2.

**CAUTION**

> Performing the following tests will cause an interruption in
> processing of beacon targets. Coordinate testing with supervisory
> personnel at the air traffic center.

a\. Channel A STC 1

b\. Channel A STC 2

c\. Channel B STC 1

d\. Channel B STC 2

e\. SSR Alarm Clear

f\. High Voltage On/Off

g\. Radar Ch A Select

h\. Radar Ch B Select

i\. Ch A APS Coolant Pump Reset

j\. Ch B APS Coolant Pump Reset

k\. Polarization Select LP/CP (perform at discretion of site personnel)

[6.2.2.5 ASR-8 Checks]{.underline}.-

[6.2.2.5.1 ASR-8 Status Readings]{.underline}.- Verify that the
following RMC status readings agree with the settings of the ASR-8. Be
sure to change the configuration of the ASR-8 to both possible settings
where possible and confirm that the RMC acknowledges the changes.

a\. Channel A on-line/off-line

b\. Channel B on-line/off-line

c\. Ch A high voltage on/off

d\. Ch B high voltage on/off

e\. Range Azimuth Gated (RAG) video status

f\. Receiver Sensitivity Max/1/2/3/4/5

g\. STC off/1/2/3

[6.2.2.5.2 ASR-8 Command Outputs]{.underline}.- Use the RMC to enable
each of the following commands. Verify that the command has actually
made a change in the status of the ASR-8.

**CAUTION**

> Performing the following tests will cause an interruption in
> processing of beacon targets. Coordinate testing with supervisory
> personnel at the air traffic center.

a\. Channel A on-line/off-line select

b\. Channel B on-line/off-line select

c\. Ch A high voltage on/off select

d\. Ch B high voltage on/off select

e\. RAG video on/off select

f\. Receiver Sensitivity Max/1/2/3/4/5 Select

g\. STC off/1/2/3 Select

[6.2.2.6 Common Digitizer-2 (CD-2) Checks]{.underline}.-

[6.2.2.6.1 CD-2 Status Readings]{.underline}.- Verify that the following
RMC status readings agree with the settings of the CD-2. Be sure to
change the configuration of the CD-2 to both possible settings where
possible and confirm that the RMC acknowledges the changes.

a\. Channel A on-line

b\. Channel B on-line

c\. Auto channel select enabled

d\. CD-2 communications normal

e\. RACI status normal

f.  Channel A health count matches CD-2

g\. Channel B health count matches CD-2

[6.2.2.6.2 CD-2 Command Outputs]{.underline}.- Use the RMC to enable
each of the following commands. Verify that the command has actually
made a change in the status of the CD-2.

**CAUTION**

> Performing the following tests will cause an interruption in
> processing of beacon targets. Coordinate testing with supervisory
> personnel at the air traffic center. Perform tests at the discretion
> of the system specialist.

a\. Pulse channel A ac power off/on

b\. Pulse channel B ac power off/on

c\. Toggle auto select between auto and manual

d\. Select channel A

e\. Select channel B

f\. Total power reset

[6.2.2.7 RMC Environmental Monitor and Control]{.underline}.-

[6.2.2.7.1 Engine Generator (E/G) and Environmental Status
Readings]{.underline}.- Verify that the following RMC status readings
agree with the settings of the E/G and environmental sensors. Be sure to
change the configuration of the E/G and environmental sensors to both
possible settings where possible and confirm that the RMC acknowledges
the changes.

a\. E/G running/halted

b\. E/G on-line/off-line

c\. Security Alarm

d\. Fire Alarm

[6.2.2.7.2 E/G Command Outputs]{.underline}.- Use the RMC to enable each
of the following commands. Verify that the command has actually made a
change in the status of the E/G.

**CAUTION**

> Performing the following tests may cause an interruption in processing
> of beacon targets. Coordinate testing with supervisory personnel at
> the air traffic center.

a\. Start E/G

b\. Stop E/G

[6.2.2.8 RMC System]{.underline}.-

[6.2.2.8.1 RMC DPSU Power Supply (not monitored by RMC)]{.underline}.-
Verify proper operation of DPSU power supply as follows:

6.2.2.8.1.1 Verify that DPSU Power Supply 1A6PS is operating.

6.2.2.8.1.2 Measure the voltages between terminal blocks A01 and A02,
A03 and A04, and between terminal blocks A05 and A06. The measured
voltages should be +24 V dc.

[6.2.2.8.2 Command Enable]{.underline}.- Confirm that the RMC command
enable is functioning properly by toggling the command enable switch and
observing the RMC local display.

[6.2.2.9 ATCBI-4 Checks]{.underline}.-

[6.2.2.9.1 ATCBI-4 Status Readings]{.underline}.- Verify that the
following RMC status readings agree with the settings of the ATCBI-4. Be
sure to change the configuration of the ATCBI-4 to both possible
settings where possible and confirm that the RMC acknowledges the
changes.

**CAUTION**

Performing the following tests will cause an interruption in processing
of beacon targets. Coordinate testing with supervisory personnel at the
air traffic control center.

a\. ATCBI channel on-line 1/2

b\. On-line channel alarm (remove range zero from online channel)

c\. Standby channel alarm (place standby channel in maintenance)

d\. ISM alarm (will occur with the on-line beacon alarm)

[6.2.2.9.2 ATCBI-4 Command Outputs]{.underline}.- Use the RMC to enable
each of the following commands. Verify that the command has actually
made a change in the status of the ATCBI.

a\. Select ATCBI Channel 1

b\. Select ATCBI Channel 2

[6.2.2.10 ATCBI-5 Checks]{.underline}.-

[6.2.2.10.1 ATCBI-5 Status Readings]{.underline}.- Verify that the
following RMC status readings agree with the settings of the ATCBI. Be
sure to change the configuration of the ATCBI to both possible settings
where possible and confirm that the RMC acknowledges the changes.

**CAUTION**

> Performing the following tests will cause an interruption in
> processing of beacon targets. Coordinate testing with supervisory
> personnel at the air traffic control center.

a\. ATCBI channel on-line 1/2

b\. ATCBI channel 1 alarm (adjust trigger timing thumb wheels)

c\. ATCBI channel 2 alarm (adjust trigger timing thumb wheels)

d\. ISM alarm (will occur with the on-line beacon alarm)

[6.2.2.10.2 ATCBI-5 Command Outputs]{.underline}.- Use the RMC to enable
each of the following commands. Verify that the command has actually
made a change in the status of the ATCBI-5.

a\. Select ATCBI Channel 1

b\. Select ATCBI Channel 2

[6.3 CALIBRATION PROCEDURE FOR ANALOG PARAMETERS]{.underline}.- The
analog interface function can monitor voltages. Therefore, calibration
procedures are needed to convert these voltage readings back into their
original values and units. Proceed with the calibra­tion procedure as
follows.

6.3.1 Measure the actual voltage of the parameter.

6.3.2 Subtract the measured value from the RMC MDT displayed value. This
is the new offset value.

6.3.3 Enter the new offset value and confirm that the MDT value matches
the actual voltage value.

[6.4 OTHER MAINTENANCE TASKS]{.underline}.- The other maintenance tasks
that follow shall be accomplished as specified in table 5-3 of this
instruction book.

[6.4.1 Interconnecting Wiring Check]{.underline}.- Inspect all
interconnecting wiring for cracked insulation, weak spots, or bends
indicating internal breaks.

[6.4.2 General Cleaning]{.underline}.- Clean all exposed external
surfaces. Remove dust that has accumulated internally. Remove dust from
air inlets and clean filters.

[6.4.3 Visual Check and Inspection]{.underline}.- All electrical
components will be checked for evidence of overheating, corrosion
damage, and/or defects. All wires will be visually inspected for faulty
insulation and exposed bare wires which may be a personnel safety hazard
and which may cause an equipment short circuit.