ORIGINAL ISSUE: 3rd 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 Bulletin 32-A-JA140940. 

TITLE: LANDING GEAR – INSPECTION OF MAIN LANDING GEAR SPECIAL WASHER 

INSTALLATION. 

INSPECTION 

ORIGINAL ISSUE: 3rd 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 GEAR 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 relative to the Main Landing Gear 

(MLG) cylinder) of the special washer that was introduced 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 result 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 from 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 washer installed at the MLG forward 

spigot and the resulting actions. This SB is in three parts:- 

Part 1 describes the visual inspection of the special 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 special washer (i.a.w. SB32-JM7862 

Revision 3). 

Part 3 describes the follow up inspection, using the witness paint described in Part 1 or 

Part 2, to check if the special washer has migrated. 
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32-A-JA140940 ORIGINAL ISSUE: 3rd 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 migration, 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 washer and leg. 

- Clean and visually inspect the forward face of the MLG spigot housing. 

- Check for evidence of wear marks that may have been 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 housing for cracks (only required for 

cylinders made from DTD5094). 

- Restore the protective treatment on the forward face 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 top inboard side edge of the special 

washer tab and onto the flat of the MLG spigot housing. 

- 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 to 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 Systems and await instructions before 

further flight. 

- Report all findings to BAE Systems, including if no faults are found. 
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ORIGINAL ISSUE: 3rd 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. 
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32-A-JA140940 ORIGINAL ISSUE: 3rd 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 landing 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 Jetstream 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 of 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 the 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, whichever 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 cylinder in accordance with Part 2 of this 

SB. For gears with DTD5094 cylinders (see note above) this is to be performed within 

200 cycles or 2 calendar months of the issue date of this SB, whichever is the earlier. 

For gears with L161 cylinders this is to be performed within 600 cycles or 6 calendar 

months of the issue date of this SB, whichever is the earlier. 

NOTE: Part 2 of this SB applies if the forward spigot bearing cap was ever installed 

with the bearing locking pins facing the special washer (as per SB JM7862 

Revision 1), even if the cap has subsequently been reinstalled with the 

locking pins facing forward and there is no evidence of washer migration. 

For all landing gears, after Part 1 or Part 2 of this 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: 3rd 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 SYSTEM 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 ACCORDANCE 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 SYSTEMS ARE MADE 

SAFE AS DETAILED IN THE APPLICABLE CHAPTERS OF THE AIRCRAFT 

MAINTENANCE MANUAL. 

WARNING: THE MINIMUM CLEARANCE BETWEEN MOVING AND STRUCTURAL PARTS 

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

CAUTION: TO AVOID DAMAGE, MAKE SURE BEFORE MOVING CONTROLS THAT 

CONTROL RUNS AND CONTROL SURFACES ARE FREE FROM 

OBSTRUCTION. 

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

DRILLED. REMOVE ALL UNWANTED MATERIAL FROM THE WORK AREA. 

CAUTION: IF AN ELECTRICAL CONNECTION OR CONNECTOR IS DISMANTLED, 

ASSEMBLED OR REPLACED, DO A CONTINUITY CHECK AND, IF 

APPLICABLE, A SCREEN BONDING CHECK BEFORE THE ASSEMBLY IS 

CONNECTED TO EQUIPMENT. 

NOTE: Abbreviations used in the accomplishment instructions 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 aircraft bus-bars. 

(2) Gain access to the MLG. 
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32-A-JA140940 ORIGINAL ISSUE: 3rd October 2014 

PAGE 6 

B. Accomplishment - Use material kit number JA140940 (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 visual 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 (visible gap) or not parallel to the flat on 

top of the MLG spigot housing, this is evidence that 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 migration, refer to Figure 1 Detail C and 

apply a small amount of suitable witness paint (such 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 of 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 remove the affected MLG from the 

aircraft. 

(2) Remove and retain bearing p/n 13744B29. 

(3) Locate the forward spigot in the MLG cylinder subassembly 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 washer and leg. 

(6) Clean surface of the forward face of the MLG spigot housing with white spirit or 

equivalent. Visually inspect the forward face of the MLG spigot housing using 10X 

magnification and a bright light for evidence of wear marks that may have been 

caused by migration of the special washer. 

(7) Check the forward face of the MLG spigot housing using 10X magnification and a 

bright light for evidence corrosion. 
SERVICE BULLETIN

ORIGINAL ISSUE: 3rd 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. Operators must enquire to Heroux 

Devtek, for any cracks or corrosion in excess of these 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 face 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 overhaul 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 the 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 perform 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 still intact. 
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32-A-JA140940 ORIGINAL ISSUE: 3rd 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 are found, to BAE Systems on the 

Operator Report Form attached. 

Part 3 

(1) Refer to Figure 1 Detail C and check that the witness paint between the special 

washer tab and the flat of the MLG spigot housing is 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 records. 

(2) Inform BAE Systems of the accomplishment of this SB using the Accomplishment 

Report attached. 
SERVICE BULLETIN

ORIGINAL ISSUE: 3rd October 2014 32-A-JA140940 

PAGE 9 

Inspection of Main Landing Gear Special Washer Installation. 

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

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ORIGINAL ISSUE: 3rd 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 prior 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 7414 
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32-A-JA140940 ORIGINAL ISSUE: 3rd October 2014 

PAGE 12 

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ORIGINAL ISSUE: 3rd 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 relevant 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: 3rd October 2014 

PAGE 14 

BLANK PAGE 
abcd OPERATOR REPORT FORM 

This Operator Report Form is required to be completed 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 Gear 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 relation to each of Parts 1, 2 and 3 of this SB. 

Part 1 - Any evidence of migration of the special washer installed at the left/right MLG forward spigot? 

Part 2 - Any corrosion or wear marks on the forward face of the left/right MLG spigot housing and if so 

to what extent? 

Part 3 - Any evidence of migration of the special washer installed at the left/right MLG forward spigot? 

abcd ACCOMPLISHMENT REPORT 

SERVICE BULLETIN NUMBER 32-A-JA140940 

TITLE: LANDING GEAR – INSPECTION OF MAIN LANDING GEAR 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 HAS BEEN EMBODIED ON 

AIRCRAFT CONSTRUCTORS NUMBER(S): 

WE REQUEST THE APPROPRIATE REVISIONS TO APPLICABLE MANUALS. 

NAME: .................................................................................. 

SIGNED: ............................................................................... 

COMPANY: .......................................................................... 

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

SERVICE BULLETIN COMMENTS/FEEDBACK. 

Please report any non-technical comments or inaccuracies regarding this service bulletin to the 

above address.