ORIGINAL ISSUE: 8 th April 2013 32 -JM7862

REVISION 1: 7 th 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 JM 7862

1. PL ANNING 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: 8 th April 2013

PAGE 2 REVISION 1: 7 th May 2013

The tasks are as follows:

- De -energi ze 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 wash er

. - Reinstall forward spigot. - Replace forward split bearing. - Rei ns tall 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. Referenc es - 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: 8 th April 2013

PAGE 4 REVISION 1: 7 th May 2013 BLANK PAGEORIGINAL ISSUE: 8 th April 2013 32 -JM7862

REVISION 1: 7 th May 2013 PAGE 5 2. ACCOMPLISHMENT INSTRUCTIONS

INDEPE NDENT 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

SAF E 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: 8 th April 2013

PAGE 6 REVISION 1: 7 th 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: 8 th April 2013 32 -JM7862

REVISION 1: 7 th 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: 8 th April 2013

PAGE 8 REVISION 1: 7 th 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: 8 th April 2013 32 -JM7862

REVISION 1: 7 th 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: 8 th April 2013

PAGE 10 REVISION 1: 7 th May 2013

INSTALLATION OF SPECIAL WASHER AND NEW BEARING FIGURE 1ORIGINAL ISSUE: 8 th April 2013 32 -JM7862

REVISION 1: 7 th 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 Sealin g compound32 -JM7862 ORIGINAL ISSUE: 8 th April 2013

PAGE 12 REVISION 1: 7 th May 2013 BLANK PAGEORIGINAL ISSUE: 8 th April 2013 32 -JM7862

REVISION 1: 7 th May 2013 PAGE 13 4. CONTINUED AIRWORTHINESS

A. Continued Airworthiness Instructi ons 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 S B.

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

TI TLE: 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 APP LICABLE MANUALS.

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

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

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

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

SERVICE BULLETIN COMMENTS/FEEDBACK

. Please report any non

- technical comments or inaccuracies regarding this service bulletin to the above a ddress.ORIGINAL ISSUE: 7 th 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 31 st 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.