ORIGINAL ISSUE: 3 rd October 2014 32-A-JA140940 PAGE 1 OF 1 

# SERVICE BULLETIN

BAE SYSTEMS (OPERATIONS) LIMITED, PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA9 2RW, SCOTLAND.
32-A-JA140940

TRANSMITTAL SHEET

This page transmits the original issue of Service B ulletin 32-A-JA140940.

TITLE: LANDING GEAR – INSPECTION OF MAIN LANDING GE AR SPECIAL WASHER INSTALLATION.

INSPECTIONORIGINAL ISSUE: 3 rd October 2014 32-A-JA140940 PAGE 1 OF 14 

# SERVICE BULLETIN

BAE SYSTEMS (OPERATIONS) LIMITED, PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA9 2RW, SCOTLAND.
32-A-JA140940

TITLE: LANDING GEAR – INSPECTION OF MAIN LANDING GE AR SPECIAL WASHER INSTALLATION.
INSPECTION

1. PLANNING INFORMATION A. Effectivity
All Jetstream Series 3100 and 3200 aircraft.
B. Reason Cases have been reported of migration (rotation rel ative to the Main Landing Gear (MLG) cylinder) of the special washer that was intr oduced by Service Bulletin (SB) 32- JM7862. The migration is believed to be caused when the bearing cap has been installed with the bearing locking pins facing the special washer, as per SB 32-JM7862 Revision 1. If adverse tolerances also exist, then the bearing locking pins can foul the special washer. Such fouling could prevent the special washer from rotating with the landing gear during retraction and extension and may cause degradation of the corrosion protection on the forward face of the MLG spigot (pintle) housing by the action of rubbing under pressure. Loss of corrosion protection in this area could res ult in the onset of corrosion pitting. Corrosion pitting is undesirable on cylinders made from L161. On cylinders made from DTD5094, stress corrosion cracking can initiate fro m corrosion pits. Stress corrosion cracking has been known to result in failure of the MLG spigot housing, resulting in the collapse of the MLG. C. Description This SB describes the inspection of the special was her installed at the MLG forward spigot and the resulting actions. This SB is in thr ee parts:- Part 1 describes the visual inspection of the speci al washer installation to determine if the special washer has migrated. Part 2 describes the removal of the special washer, checking the MLG spigot housing for damage and installing a new or serviceable spec ial washer (i.a.w. SB32-JM7862 Revision 3). Part 3 describes the follow up inspection, using th e witness paint described in Part 1 or Part 2, to check if the special washer has migrated

.SERVICE BULLETIN

32-A-JA140940 ORIGINAL ISSUE: 3 rd October 2014 PAGE 2 Part 1 tasks are as follows:-

- Perform a visual inspection of the special washer for evidence of migration. - If there is no evidence of special washer migrati on, apply a small amount of suitable witness paint over the top inboard side edge of the special washer tab and onto the flat of the MLG spigot housing.

Part 2 tasks are as follows:- - Remove the affected MLG leg from the aircraft. - Remove the forward (flanged) spigot (pintle) pin from the leg. - Remove the special washer from the leg. - Remove any remains of gasket material on the wash er and leg. - Clean and visually inspect the forward face of th e MLG spigot housing. - Check for evidence of wear marks that may have be en caused by migration of the special washer. - Check for any signs of corrosion. - Remove all corrosion and wear marks. - Perform an NDT inspection of the MLG spigot housi ng for cracks (only required for cylinders made from DTD5094). - Restore the protective treatment on the forward f ace of the MLG spigot housing. - Inspect the special washer for wear and damage. - Discard special washer if worn or damaged. - If necessary, install a new special washer. - Apply a small amount of witness paint over the to p inboard side edge of the special washer tab and onto the flat of the MLG spigot hous ing. - Install the forward (flanged) spigot (pintle) pin on the MLG leg. - Install the MLG leg on the aircraft. - Perform retraction/extension check of the MLG. - Check that the witness paint is still intact. - If the witness paint is broken, report findings t o BAE Systems and await instructions before further flight. - Report all findings to BAE Systems, including if no faults found.

Part 3 tasks are as follows:- - Check that the witness paint between the special washer tab and the flat of the MLG spigot housing is still intact. - If the paint is broken, report findings to BAE Sy stems and await instructions before further flight. - Report all findings to BAE Systems, including if no faults are found.SERVICE BULLETIN

ORIGINAL ISSUE: 3 rd October 2014 32-A-JA140940 PAGE 3 D. Manpower Part 1 = 1 hour, Part 2 = 8 hours per affected leg, Part 3 = 1 hour. Mechanical skills are necessary.
E. Material - Cost and Availability Cost and availability is by arrangement between the Operator and BAE SYSTEMS.
F. Tooling - Price and Availability Not applicable.
G. Weight and Balance
Not affected.

H. Aircraft Noise Levels
Not affected.

I. Electrical Load Data
Not affected.
J. Software Accomplishment Summary Not applicable.

K. References - Aircraft Maintenance Manual Chapters 24 and 32. - SB 32-A-JA851226. - SB 32-JM7862 at Revision 3 or later. - SRM 51-10-31. - MLG CMM’s 31-10-01, -02, -03.

L. Publications Affected Not applicable.
M. Family Tree Of Modification Relationships Not applicable.SERVICE BULLETIN

32-A-JA140940 ORIGINAL ISSUE: 3 rd October 2014 PAGE 4 N. Approval
The technical content of this SB is the subject of EASA Airworthiness Directive consultation. Compliance with this SB must be achieved as follows :- NOTE: For compliance purposes, the following landin g gear part numbers have

cylinders made from DTD5094:- Left Hand Types: 1863 (without strike off 3), 1863/ 4A, 1863/4B and 1863/4C

(Pre Mod 86--04--003 Re--issue 6), B00A702850A (without strike off 7 or 16), B00A702925A (without strike off 5 or 15). Right Hand Types: 1864 (without strike off 3), 1864 /4A, 1864/4B and 1864/4C,

(Pre Mod 86--04--003 Re--issue 6), B00A702851A (without strike off 7 or 16), B00A702926A (without strike off 5 or 15). All other gear part numbers (including all Jetstrea m Series 3200 gear types) have cylinders made from L161. On landing gears (left hand or right hand) where SB 32-JM7862 was first accomplished at revision 2, perform an inspection for evidence o f special washer migration (Part 1 of this SB). For landing gears with DTD5094 cylinders (see note above) this is to be performed within 50 cycles or 2 calendar weeks of t he issue date of this SB, whichever is the earlier. For gears with L161 cylinders this is to be performed within 300 cycles or 3 calendar months of the issue date of this SB, whi chever is the earlier. On landing gears (left hand or right hand) where SB 32-JM7862 was first accomplished at revision 1 or where inspection to Part 1 of this SB reveals evidence of special washer migration, perform an inspection of the MLG cylinde r in accordance with Part 2 of this SB. For gears with DTD5094 cylinders (see note abov e) this is to be performed within 200 cycles or 2 calendar months of the issue date o f this SB, whichever is the earlier. For gears with L161 cylinders this is to be perform ed within 600 cycles or 6 calendar months of the issue date of this SB, whichever is t he earlier. NOTE: Part 2 of this SB applies if the forward spig ot bearing cap was ever installed

with the bearing locking pins facing the special wa sher (as per SB JM7862 Revision 1), even if the cap has subsequently been reinstalled with the locking pins facing forward and there is no evidenc e of washer migration. For all landing gears, after Part 1 or Part 2 of th is SB has been accomplished, perform an inspection in accordance with Part 3 of this SB between 4 and 6 calendar weeks or between 20 and 30 cycles, whichever is the earlier. For any landing gear on which SB 32-JM7862 has not yet been accomplished no immediate action is required. For all the above calendar and flight cycle limits, whichever occurs first applies. The technical content of this SB is approved under the authority of EASA PART 21 Approval No. EASA.21J.047.SERVICE BULLETIN

ORIGINAL ISSUE: 3 rd October 2014 32-A-JA140940 PAGE 5 2. ACCOMPLISHMENT INSTRUCTIONS

INDEPENDENT INSPECTION
WHENEVER ANY PART OF THE MAIN OR ASSOCIATED SYSTEM IS DISMANTLED, ADJUSTED, REPAIRED OR RENEWED, THAT PART OF THE SYS TEM WHICH HAS BEEN DISTURBED SHALL BE SUBJECTED TO AN INDEPENDENT INSPECTION FOR SECURITY OF LOCKING DEVICES, FULL AND FREE MOVEMENT , DIRECTION AND TENSION CHECKS. THIS WORK MUST BE DONE IN ACCORDANC E WITH THE ACCEPTABLE MEANS OF COMPLIANCE M.A. 402 (a) TO EASA PART M, OR TO AN EQUIVALENT NATIONAL STANDARD.

WARNING: MAKE SURE THE AIRCRAFT AND THE AIRCRAFT SY STEMS ARE MADE

SAFE AS DETAILED IN THE APPLICABLE CHAPTERS OF THE AIRCRAFT MAINTENANCE MANUAL.

WARNING: THE MINIMUM CLEARANCE BETWEEN MOVING AND S TRUCTURAL PARTS

MUST BE 0.2 IN (5.1 MM) UNLESS OTHERWISE STATED.

CAUTION: TO AVOID DAMAGE, MAKE SURE BEFORE MOVING C ONTROLS THAT

CONTROL RUNS AND CONTROL SURFACES ARE FREE FROM OBSTRUCTION.

CAUTION: TAKE CARE NOT TO DAMAGE STRUCTURE WHEN MAT ERIAL IS CUT OR

DRILLED. REMOVE ALL UNWANTED MATERIAL FROM THE WORK AREA.

CAUTION: IF AN ELECTRICAL CONNECTION OR CONNECTOR I S DISMANTLED,

ASSEMBLED OR REPLACED, DO A CONTINUITY CHECK AND, I F APPLICABLE, A SCREEN BONDING CHECK BEFORE THE ASSEM BLY IS CONNECTED TO EQUIPMENT.
NOTE: Abbreviations used in the accomplishment inst ructions of this SB are:-
AMM - Aircraft Maintenance Manual. CMM - Component Maintenance Manual. MLG - Main Landing Gear. MRO - Maintenance, Repair and Overhaul. NDT - Non Destructive Test.
A. Preparation
(1) Refer to AMM 24-00-00 and de-energize the aircr aft bus-bars. (2) Gain access to the MLG.SERVICE BULLETIN

32-A-JA140940 ORIGINAL ISSUE: 3 rd October 2014 PAGE 6 B. Accomplishment - Use material kit number JA14094 0 (refer to paragraph 3.A.).

Part 1
(1) Refer to Figure 1 Detail B and perform a visual inspection of the special washer installed at the MLG forward spigot for evidence of special washer migration. Check that the special washer tab is flush with (no visible gap) and parallel to the flat on top of the MLG spigot housing.
NOTE: It is recommended that, if applicable, the vi sual inspection part of SB

32-A-JA851226 is carried out concurrently with Part 1 of this SB.
(2) If the special washer tab is not flush with (vi sible gap) or not parallel to the flat on top of the MLG spigot housing, this is evidence tha t the special washer may have migrated and Part 2 of this SB must be performed in accordance with the compliance requirements.
(3) If there is no evidence of special washer migra tion, refer to Figure 1 Detail C and apply a small amount of suitable witness paint (suc h as F-900 Torque Seal or Loctite 7414) over the top inboard side edge of the special washer tab and onto the flat of the MLG spigot housing. Ensure that the special washer inspection window is clean and free from foreign material such as excess gasket.
(4) Report all findings, including if no evidence o f washer migration is found, to BAE Systems on the Operator Report Form attached.

Part 2
(1) Refer to AMM 32-10-11, page block 401 and remov e the affected MLG from the aircraft. (2) Remove and retain bearing p/n 13744B29. (3) Locate the forward spigot in the MLG cylinder s ubassembly and remove as follows:- (a) Remove and discard split-pin. (b) Remove slotted nut, spigot bolt and washer. (c) Withdraw forward spigot from cylinder.
(4) Remove the special washer from the leg.
(5) Remove any remains of gasket material on the wa sher and leg.
(6) Clean surface of the forward face of the MLG sp igot housing with white spirit or equivalent. Visually inspect the forward face of th e MLG spigot housing using 10X magnification and a bright light for evidence of we ar marks that may have been caused by migration of the special washer.
(7) Check the forward face of the MLG spigot housin g using 10X magnification and a bright light for evidence corrosion.SERVICE BULLETIN

ORIGINAL ISSUE: 3 rd October 2014 32-A-JA140940 PAGE 7 (8) Remove all corrosion and wear marks i.a.w. APPH (now Heroux Devtek) SB 32- 19 (embedded in BAE Systems SB 32-A-JA851226) which provides instructions for the repair of cracks within specified limits. O perators must enquire to Heroux Devtek, for any cracks or corrosion in excess of th ese limits. The contact details for Heroux Devtek are as follows:-

Heroux Devtek, Engineering Division, Unit 1, Pembroke Court, Chancellor Road, Manor Park, Runcorn, Cheshire, WA7 1TG, England.
FAX (+44) 01928 579626 TEL (+44) 01928 532600
(9) For cylinders made from DTD5094, perform an NDT inspection of the MLG spigot housing for cracks i.a.w. SB 32-A-JA851226.
(10) Restore protective treatment on the forward fa ce of the MLG spigot housing using Alocrom (or Alodine) 1200. NOTE: The aft face of the MLG spigot housing should have primer and paint

applied. There has been at least one reported case of primer and paint not being applied to this face by a MRO during over haul of the MLG. Check for primer and paint on the aft face. If not applied, inspect for and remove any corrosion as for the front face. Restore the full protective treatment (Alocrom, primer and paint) i.a.w. with t he MLG CMM.
(11) Visually inspect the special washer for signs of wear and damage. Discard any special washer showing signs of wear or damage. NOTE: Special washers with wear marks/damage to the cadmium plating on

the inner (MLG cylinder facing) must be discarded. Special washers with tabs deformed or bent so they are not at 90° must also be discarded.
(12) Install a new or serviceable special washer p/ n 13744B31 i.a.w. SB 32-JM7862 Revision 3 or later. (13) Re-install forward spigot, bearing and MLG i.a .w. SB 32-JA7862 Revision 3 or later.
(14) Refer to AMM 32-30-00, page block 201 and perf orm undercarriage retraction/extension check.
(15) Refer to Figure 1 Detail C and check that the witness paint between the special washer tab and flat of the MLG spigot housing is st ill intact.SERVICE BULLETIN

32-A-JA140940 ORIGINAL ISSUE: 3 rd October 2014 PAGE 8 (16) If the paint is broken, report findings to BAE Systems and await further

instructions before further flight.
(17) Report all findings, including if no faults ar e found, to BAE Systems on the Operator Report Form attached.

Part 3
(1) Refer to Figure 1 Detail C and check that th e witness paint between the special washer tab and the flat of the MLG spigot housing i s still intact. (2) If the paint is broken, report findings to BAE Systems and await further instructions before further flight. (3) Report all findings, including if no faults are found, to BAE Systems on the Operator Report Form attached.
C. Testing (1) Not applicable.
D. Recovery (1) Aircraft records:-
(a) Add SB number “32-A-JA140940” to the aircraft r ecords.
(2) Inform BAE Systems of the accomplishment of thi s SB using the Accomplishment Report attached.SERVICE BULLETIN

ORIGINAL ISSUE: 3 rd October 2014 32-A-JA140940 PAGE 9 Inspection of Main Landing Gear Special Washer Inst allation. Figure 1SERVICE BULLETIN

32-A-JA140940 ORIGINAL ISSUE: 3 rd October 2014 PAGE 10 BLANK PAGESERVICE BULLETIN

ORIGINAL ISSUE: 3 rd October 2014 32-A-JA140940 PAGE 11 3. MATERIAL INFORMATION
NOTE: The new part numbers shown in paragraph 3.A. are necessary to accomplish this SB on one aircraft. Use the material kit number shown to order the parts.
A. New parts supplied as a material kit - order kit number JA140940.

New Part No. QTY Keyword Old Part No. 13744B31 2 Special washer 13744B31

NOTE: The special washer may require modification p rior to installation (see SB 32-JA7862 Revision 3 or later).
B. Materials required - Operators Supply

Material No. QTY Keyword - A/R Alocrom (or Alodine) 1200 - A/R White spirit or equivalent - A/R Epoxy primer - A/R Polyurethane paint

- A/R F-900 Torque Seal Alternative Loctite 7414SERVICE BULLETIN

32-A-JA140940 ORIGINAL ISSUE: 3 rd October 2014 PAGE 12 BLANK PAGESERVICE BULLETIN

ORIGINAL ISSUE: 3 rd October 2014 32-A-JA140940 PAGE 13 4. CONTINUED AIRWORTHINESS

A. Continued Airworthiness Instructions
The following information is provided to Operators to permit continued operation of the aircraft pending receipt of a formal revision to the relevan t aircraft manuals.

B. Scheduled Maintenance
(1) Not applicable.

C. Removal Procedures
(1) Refer to part 2.B. of this SB.

NOTE: Removal is the reverse of installation.

D. Installation Procedures
(1) Refer to part 2.B. of this SB.

E. Test Procedures
(1) Not applicable.
F. Trouble Shooting
(1) Not applicable.SERVICE BULLETIN

32-A-JA140940 ORIGINAL ISSUE: 3 rd October 2014 PAGE 14 BLANK PAGE

# abcd OPERATOR REPORT FORM

This Operator Report Form is required to be complet ed and returned to:- BAE SYSTEMS Regional Aircraft, Customer Engineering Liaison, Building 37, Prestwick International Airport, Ayrshire KA9 2RW, SCOTLAND. Tel. No. +44 (0)1292 67 5276. FAX. No. +44 (0)1292 67 5700.
Title Landing Gear – Inspection of Main Landing Gea r Special Washer Installation.
Service Bulletin no. Operator Maintenance Organisation name, e-mail and phone no. Aircraft

Registration and Constructors no. Flying Hours No. of Landings

32-A-JA140940

Findings/comments for Left and Right Hand MLGs in r elation to each of Parts 1, 2 and 3 of this SB.

Part 1 - Any evidence of migration of the special w asher installed at the left/right MLG forward spigo t?

Part 2 - Any corrosion or wear marks on the forward face of the left/right MLG spigot housing and if s o to what extent?

Part 3 - Any evidence of migration of the special w asher installed at the left/right MLG forward spigo t?

# abcd ACCOMPLISHMENT REPORT

SERVICE BULLETIN NUMBER 32-A-JA140940

TITLE: LANDING GEAR – INSPECTION OF MAIN LANDING GE AR SPECIAL WASHER INSTALLATION.



### TO: BUSINESS SUPPORT TEAM, TECHNICAL PUBLICATIONS, BAE SYSTEMS (OPERATIONS) LIMITED, PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA9 2RW, SCOTLAND.
Telephone: (01292) 675207 Fax: (01292) 675704 E-mail: RAPublications@baesystems.com

PLEASE BE ADVISED THAT THE ABOVE SERVICE BULLETIN H AS BEEN EMBODIED ON AIRCRAFT CONSTRUCTORS NUMBER(S):

WE REQUEST THE APPROPRIATE REVISIONS TO APPLICABLE MANUALS.

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DATE: ............................................

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