ORIGINAL ISSUE: 8th April 2013 32-JM7862 

REVISION 1: 7th May 2013 PAGE 1 OF 14 

BAE SYSTEMS (OPERATIONS) LIMITED, 

PRESTWICK INTERNATIONAL AIRPORT, 

AYRSHIRE, KA9 2RW, 

SCOTLAND. 

32-JM7862

TITLE: LANDING GEAR - INTRODUCTION OF SPECIAL WASHER TO PROTECT THE MAIN 

LANDING GEAR CYLINDER AT THE FORWARD SPIGOT. 

MODIFICATION NUMBER JM7862

1. PLANNING INFORMATION 

A. Effectivity 

All Jetstream Series 3100 and 3200. 

B. Reason 

On Series 3100 aircraft, which did not have L161 material Main Landing Gear (MLG) 

cylinders (Service Bulletin 32-JA880340) there have been cases of MLG cylinder stress 

corrosion cracking (including failure) originating at the forward face of the cylinder 

around the gear mounting spigot (yoke pintle housing). The protective treatments in this 

area can be damaged by rubbing against the spigot bearing in the gear attachment 

structure in the wing during gear retraction and extension, thereby allowing stress 

corrosion cracking to initiate. 

Although all Series 3200 aircraft have L161 material MLG cylinders, accomplishment of 

this Service Bulletin (SB) additionally includes Series 3200 aircraft. This will reduce 

scrappage rates at overhaul and maintain commonality of parts and installation method 

with Series 3100 aircraft. 

C. Description 

This SB introduces a special washer fitted at the forward spigot on both left and right 

MLGs. The washer is attached to the forward and top faces of the MLG cylinder spigot 

housing using an anaerobically curing, low adhesion, liquid gasket. 

To accommodate the thickness of the new washer, a new spigot split bearing with 

reduced flange thickness is also introduced by this SB. 
32-JM7862 ORIGINAL ISSUE: 8th April 2013 

PAGE 2 REVISION 1: 7th May 2013 

The tasks are as follows: 

- De-energize aircraft bus-bars. 

- Remove MLG. 

- Remove forward spigot. 

- Inspect (NDT) spigot (pintle) housing for cracks, if applicable. 

- Restore protective treatment, if necessary. 

- Install new special washer. 

- Reinstall forward spigot. 

- Replace forward split bearing. 

- Reinstall MLG and perform functional test. 

- Amend aircraft records. 

D. Manpower 

15 man-hours. 

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 24-00-00, 32-10-11 and 32-30-00. 

- SB 32-A-JA851226. 

- SRM 51-10-31. 

32-JM7862 ORIGINAL ISSUE: 8th April 2013 

PAGE 4 REVISION 1: 7th May 2013 

BLANK PAGE 
ORIGINAL ISSUE: 8th April 2013 32-JM7862 

REVISION 1: 7th May 2013 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. 

 MLG – Main Landing Gear. 

 NDT – Non Destructive Test. 

A. Preparation 

(1) Refer to AMM 24-00-00 and de-energize the aircraft bus-bars. 

B. Accomplishment - Use material kit number JM7862 (refer to paragraph 3A). 

NOTE: The following accomplishment instructions are in two parts, one for the left 

MLG and the other for the right MLG. Both MLGs do not have to be modified at 

the same time. The modification and SB should only be claimed when both 

MLGs have been modified. 
32-JM7862 ORIGINAL ISSUE: 8th April 2013 

PAGE 6 REVISION 1: 7th May 2013 

Left MLG 

(1) Refer to AMM 32-10-11 page block 401 and remove the left MLG. 

(2) 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. 

(3) Remove any paint or primer from the forward face of the MLG spigot housing in 

accordance with SRM 51-10-31. 

(4) Refer to SB 32-A-JA851226 and, if applicable, do a NDT inspection of the MLG 

spigot (pintle) housing for cracks. 

(5) Check the condition of the forward face of the MLG spigot housing and, if 

necessary, restore protective treatment using Alocrom (or Alodine) 1200. Do not 

apply primer or paint. 

(6) Refer to figure 1 view D. Position the special washer p/n 13744B31 (item 1) over 

the spigot housing bore and mark the inside face of the washer to show the 

material to be removed to enable the washer to match the bottom of the bore. 

(7) Refer to figure 1 view D. Trim the new special washer p/n 13744B31 (item 1). 

NOTE : Only a small amount of material should need to be removed to allow fitment of 

the special washer on Series 3100 landing gears. For Series 3200 landing 

gears, up to 0.080 in. of material may need to be removed. The base material 

of the washer is corrosion resistant steel. So, there is no need to reprotect the 

trimmed edge. Take care not to damage the protective treatment on the inside 

and outside faces of the washer. 

(8) Refer to figure 1 and install the new special washer p/n 13744B31 (item 1) as 

follows:- 

(a) In accordance with the manufacturer’s instructions, apply Loctite 5203 liquid 

gasket to the inside faces of the special washer. 

(b) Clamp the special washer to the forward face of the cylinder whilst the 

gasket cures. 

NOTE : Liquid gasket cure time is 24 hours at 20 Deg C or 30 mins if hot air not 

exceeding 120 Deg C is applied. 

(c) Remove any excess, particularly at the top, forward edge of the cylinder. 

(9) Reinstall the forward spigot in the MLG cylinder subassembly as follows:- 

(a) Reinstall forward spigot in cylinder subassembly. 
ORIGINAL ISSUE: 8th April 2013 32-JM7862 

REVISION 1: 7th May 2013 PAGE 7 

(b) Install spigot bolt, washer and slotted nut, with the slotted nut on the 

retraction side of the cylinder. 

(c) Tighten bolt with a maximum torque of 30 lbf inch (3.4 Nm) using a suitable 

wrench. 

(d) Lock slotted nut with new split-pin p/n SP90C8. 

(e) Coat head and nut of spigot bolt with sealing compound to AMS-S-8802 or 

DTD 900/4502 (PR1422A2). 

(10) Refer to figure 1 and discard the forward split bearing p/n 13744B11 and replace 

with new bearing p/n 13744B29 (item 2) as shown. 

(11) Refer to AMM 32-10-11 page block 401 and reinstall the left MLG. 

Right MLG 

(1) Refer to AMM 32-10-11 page block 401 and remove the right MLG. 

(2) 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. 

(3) Remove any paint or primer from the forward face of the MLG spigot housing in 

accordance with SRM 51-10-31. 

(4) Refer to SB 32-A-JA851226 and, if applicable, do a NDT inspection of the MLG 

spigot (pintle) housing for cracks. 

(5) Check the condition of the forward face of the MLG spigot housing and, if 

necessary, restore protective treatment using Alocrom (or Alodine) 1200. Do not 

apply primer or paint. 

(6) Refer to figure 1 view D. Position the special washer p/n 13744B31 (item 1) over 

the spigot housing bore and mark the inside face of the washer to show the 

material to be removed to enable the washer to match the bottom of the bore. 

(7) Refer to figure 1 view D. Trim the new special washer p/n 13744B31 (item 1). 

NOTE : Only a small amount of material should need to be removed to allow fitment of 

the special washer on Series 3100 landing gears. For Series 3200 landing 

gears, up to 0.080 in. of material may need to be removed. The base material 

of the washer is corrosion resistant steel. So, there is no need to reprotect the 

trimmed edge. Take care not to damage the protective treatment on the inside 

and outside faces of the washer. 

(8) Refer to figure 1 and install the new special washer p/n 13744B31 (item 1) as 

follows:- 
32-JM7862 ORIGINAL ISSUE: 8th April 2013 

PAGE 8 REVISION 1: 7th May 2013 

(a) In accordance with the manufacturer’s instructions, apply Loctite 5203 liquid 

gasket to the inside faces of the special washer. 

(b) Clamp the special washer to the forward face of the cylinder whilst the 

gasket cures. 

NOTE : Liquid gasket cure time is 24 hours at 20 Deg C or 30 mins if hot air not 

exceeding 120 Deg C is applied. 

(c) Remove any excess, particularly at the top, forward edge of the cylinder. 

(9) Reinstall the forward spigot in the MLG cylinder subassembly as follows:- 

(a) Reinstall forward spigot in cylinder subassembly. 

(b) Install spigot bolt, washer and slotted nut, with the slotted nut on the 

retraction side of the cylinder. 

(c) Tighten bolt with a maximum torque of 30 lbf inch (3.4 Nm) using a suitable 

wrench. 

(d) Lock slotted nut with new split-pin p/n SP90C8. 

(e) Coat head and nut of spigot bolt with sealing compound to AMS-S-8802 or 

DTD 900/4502 (PR1422A2). 

(10) Refer to figure 1 and discard the forward split bearing p/n 13744B11 and replace 

with new bearing p/n 13744B29 (item 2) as shown. 

(11) Refer to AMM 32-10-11 page block 401 and reinstall the right MLG. 

C. Testing 

(1) Refer to AMM 32-30-00 page block 201 and do a functional test of the MLG. 

D. Recovery 

(1) Aircraft records:- 

(a) Add SB number “32-JM7862 Left” and/or “32-JM7862 Right” to the aircraft 

records as appropriate. 

(b) When both the left and right MLGs have been modified, add modification 

number JM7862 to the aircraft records. 
ORIGINAL ISSUE: 8th April 2013 32-JM7862 

REVISION 1: 7th May 2013 PAGE 9 

NOTE: Operators are reminded of the necessity to inform:- 

The Business Support Team, 

Technical Publications, 

BAE SYSTEMS (Operations) Limited, 

Prestwick International Airport, 

Ayrshire, 

KA9 2RW, 

SCOTLAND, 

of the accomplishment of this SB in order to obtain the necessary revisions for the 

affected manuals, see paragraph 1.L. Publications Affected, of this SB. 
32-JM7862 ORIGINAL ISSUE: 8th April 2013 

PAGE 10 REVISION 1: 7th May 2013 

INSTALLATION OF SPECIAL WASHER AND NEW BEARING 

FIGURE 1 
ORIGINAL ISSUE: 8th April 2013 32-JM7862 

REVISION 1: 7th May 2013 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 JM7862. 

New Part No. QTY Keyword Old Part No.

13744B31 2 Special washer -

13744B29 2 Bearing 13744B11

B. Materials required - Operators Supply 

Material No. QTY Keyword

- A/R Alocrom (or Alodine) 1200

- A/R Loctite 5203 liquid gasket

SP90C8 2 Split pin

PR1422A2 A/R Sealing compound
32-JM7862 ORIGINAL ISSUE: 8th April 2013 

PAGE 12 REVISION 1: 7th May 2013 

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ORIGINAL ISSUE: 8th April 2013 32-JM7862 

REVISION 1: 7th May 2013 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) Refer to part 2.C of this SB. 

F. Trouble Shooting 

(1) Not applicable. 

ACCOMPLISHMENT REPORT

SERVICE BULLETIN NUMBER 32-JM7862 

TITLE: LANDING GEAR - INTRODUCTION OF SPECIAL WASHER TO PROTECT THE MAIN 

LANDING GEAR CYLINDER AT THE FORWARD SPIGOT.

TO: THE 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. 

ORIGINAL ISSUE: 7th May 2013 32-JM7862 

PAGE 1 OF 1 

BAE SYSTEMS (OPERATIONS) LIMITED, 

PRESTWICK INTERNATIONAL AIRPORT, 

AYRSHIRE, KA9 2RW, 

SCOTLAND. 

32-JM7862

TRANSMITTAL SHEET 

This page transmits Revision 1 of Service Bulletin 32-JM7862, pages 1 to 13. 

TITLE: LANDING GEAR - INTRODUCTION OF SPECIAL WASHER TO PROTECT THE MAIN 

LANDING GEAR CYLINDER AT THE FORWARD SPIGOT. 

MODIFICATION NUMBER JM7862 

NOTE: Aircraft with modification JM7862 embodied still require to be inspected in acordance with 

SB 32-A-JA851226. 

REASON FOR ISSUE 

To embody the following changes as a result of Proof Installation: 

Para 1 N. third sentence revised to include ‘after 31st of July 2013’. 

Paras 2 B.(6) and (7) plus NOTE added to Left and Right MLG accomplishment to detail 

modification of special washer p/n 13744B31 which compensates for variations in spigot housing 

thickness between J31 and J32 aircraft. 

Para 2 B. (8) has NOTE added to detail cure times for liquid gasket. 

Figure 1 has view added showing area of special washer p/n 13744B31 where material is removed 

to match spigot housing bore. 

INSTRUCTION FOR INCORPORATION 

Insert Service Bulletin at Revision 1.