(OVER) 

# SERVICE **BULLETIN**

Date: June 12, 2015 (S) 

## NO. 

# 1283

**S ub**  **j ect**  : **Ca bin**  **Altitu d**  **e E**  **nc od**  **er I**  **nst a**  **ll a**  **ti o**  **n Mod**  **i f**  **ic a**  **ti o**  **n**

**Mod els**  **A ff**  **ecte d**  : **S eri**  **a l**  **N umbers**  **A ff**  **ecte d**  : PA-46-350P Mirage/M350 4636460, 4636463 through 4636632, 4636634 through 4636662
PA-46-500TP Meridian/M500 4697340, 4697399 through 4697591, 4697593 through 4697595, 4697597, 4697598

**Co m**  **p li**  **a nce**  **T ime**  **:**

**P art I**  : Modification is to be made prior to next flight. If necessary, operators are allowed up to 10 hours of operation in order to reach a maintenance facility capable of performing the modification mandated by Part I of this service bulletin, provided that instructions in the CAUTION statement below are followed prior to each flight.

**C A**  **UTI O**  **N** : as part o f eac h pre fl i gh t c h ec k, t h e o w ner / operator s h a ll g rasp t h e k nur l ed h o l ddo w n nut w it h a b are h and and veri fy t h at t h e nut is ti gh t and secure , U nti l t h e aircra f t is in f u ll comp l iance w it h a ll instructions in P art I o f t h is service b u ll etin . R e f er to Fi g ures 1 and 2.

**P art II**  : Compliance is to be accomplished on a recurring basis, at an interval not to exceed 50 hours time in service.

**A pp**  **r o**  **v a**  **l :**  The engineering aspects of this service document have been shown to comply with the applicable F ederal Aviation Regulations and are F AA approved.

**S AF**  **ETY INTENT** : If not properly secured, the cabin altitude encoder may come free from its mounting bracket. If this should occur during flight, this cabin altitude encoder may interfere with full motion of the elevator flight control system, which could lead to loss of control of the aircraft.

**C O**  **N F**  **IGUR A**  **TI O**  **N D**  **ESCRI P**  **TI O**  **N :**  This service bulletin provides instructions for the modification of the cabin altitude encoder installation by adding cable ties, and applying thread-locking fluid to the knurled holddown nut, in order to provide an additional measure of component security. 

# P **I P**  **ER C O**  **NSI D**  **ERS C**  **O M**  **P LI**  **A NCE M**  **A N**  **DA T**  **O RY** 

ATA: 2130 **Piper Aircraft, Inc.** 2926 Piper Drive Vero Beach, FL, U.S.A. 32960**SERVICE BULLETIN N O**  **. 1283 PA**  **GE 2 of 5**

**I nstructi**  **o ns**  **:**

N ote : Some steps in these instructions are identified as “required for compliance” (RC). If this service bulletin is mandated by an airworthiness directive (AD), the steps identified as RC must be done to comply with the AD. Steps not identified as RC are recommended and may be deviated from, done as a part of other actions, or done with accepted methods different from those given in S B , if the RC steps can be done and the airplane can be put back in a serviceable condition.

NOTE : Temporary removal of the crew seats may be required to accomplish the modification described below.

NOTE : These instructions are intended as a temporary solution. This service publication will be revised at a later date to communicate the final, permanent solution for securing the cabin altitude encoder to the airframe.

**C A**  **UTI O**  **N** : as part o f eac h pre fl i gh t c h ec k, t h e o w ner / operator s h a ll g rasp t h e k nur l ed h o l ddo w n nut w it h a b are h and and veri fy t h at t h e nut is ti gh t and secure , U nti l t h e aircra f t is in f u ll comp l iance w it h a ll instructions in P art I o f t h is service b u ll etin . R e f er to Fi g ures 1 and 2.

**P art I.**  **Modification**
1. RC – L ocate the cabin altitude encoder ( G AE 43, G armin part number 013-00066-00; Sandia SAE 5-35), which provides cabin pressure data , installed forward of the instrument panel (see F igures 1 and 2).

2. RC – Secure the cabin altitude encoder to its mounting bracket with a minimum of two (2) cable ties, oriented as shown in F igure 3. Cable ties shall conform to military specification MS3367, and are available from several manufacturers, including Thomas & B etts, Avery Dennison, and Panduit. Trim the cable tie tails that extend beyond the cable tie head, to avoid interference with adjacent components.

NOTE : Removal of the cabin altitude encoder from its mounting bracket is not required to accomplish the modification described in Part I, Step 2 of this service bulletin. RC – Cable ties should be snug, but not overly tightened, so as to avoid chafing against the sharp outside corners of the cabin altitude encoder housing. The proper tension can be achieved manually, without the use of a cable tie tool. RC – If cable ties are found already installed, check their condition and security; replace on condition.

3. RC – Remove the knurled holddown nut (see F igure 3). Apply L octite Threadlocker B lue 242, or an equivalent thread-locking fluid conforming to MI L -S-46163A or ASTM D5363, onto the nut’s threaded post. Reinstall the knurled holddown nut and tighten by hand. RC – If the knurled holddown nut and/or any cable ties associated with the cabin altitude encoder are removed for any reason after compliance with Part I of this service bulletin, it is mandatory that the affected aircraft be in compliance with Part I of this service bulletin prior to next flight.

4. Make a logbook entry documenting compliance with Part I of this service bulletin.

**P art II.**  **Inspection**
1. RC – Check the condition and security of the cable ties that were installed in Part I. Replace the cable ties on condition.
2. RC – Check the security of knurled holddown nut and, on condition, reapply thread-locking fluid identified in Part I.
3. Make a logbook entry documenting compliance with Part II of this service bulletin. RC –**SERVICE BULLETIN N O**  **. 1283 PA**  **GE 3 of 5**

LOOKING UPWARD AND FORWARD FROM COPILOT SIDE FORWARD OF THE INSTRUMENT PANEL KNURLED HOLDDOWN NUT (AT THE BACK OF THE UNIT, FORWARD POSITION IN THE AIRCRAFT)

**FWD**

**F igure 1**  Recommended Position to Check Security of K nurled H olddown Nut

**F igure 2**  Instrument Panel - Typical**SERVICE BULLETIN N O**  **. 1283 PA**  **GE 4 of 5**

**F igure 3**  Cabin Altitude Encoder Installation

–Three View CABIN ALTITUDE ENCODER

KNURLED HOLDDOWN NUT

**DETAIL** 

## A

LOOKING AFT ADJACENT COMPONENTS OMITTED FOR CLARITY

**FWD** MS3367 CABLE TIE MIN. 2 REQ’D TOP VIEW

BOTTOM VIEW MOUNTING

BRACKET **UP FWD** 

KNURLED HOLDDOWN NUT**SERVICE BULLETIN N O**  **. 1283 PA**  **GE 5 of 5**

**M A**  **TERI A**  **L REQUIRE D**  : RC – **P art I only:**  A minimum quantity of two (2) cable ties, MS3367 series, per aircraft; L octite Threadlocker B lue 242, or an equivalent thread-locking fluid (meeting MI L -S-46163A or ASTM D5363), quantity as required

**A**

**V**

**A IL**  **A BILITY**  **OF PA**  **RTS** : Procure locally

**Eff ectivity**  **da te**  : This service bulletin is effective upon receipt.

**S umm**  **a ry**  : Applicable factory participation is limited to new aircraft in warranty at the time of compliance.

Please contact your F actory Authorized Piper Service F acility to make arrangements for compliance with this service bulletin in accordance with the compliance time indicated.

**No te**  : Please notify the factory of any address/ownership corrections. Changes should include aircraft model, serial number, and current owner’s name and address.
Corrections and/or changes should be directed to:

PIPER AIRCRA F T, INC. Attn: Customer Service 2926 Piper Drive Vero B each, FL 32960