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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 wash er.
- Reinstall forward spigot.
- Replace forward split bearing.
- Rei nstall 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.
BRITISH AEROSPACE
JETSTREAM SERIES 7100 & 3200
SERVICE BULLETIN L. Publications Affected
- Illustrated Parts Catalogue.
- Aircraft Maintenance Manual.
Operators are requested to advise:- The Business Support Team, Technical Publications, BAE SYSTEMS (Operations) Limited, Prestwick International Airport, Ayrshire, KA9 2RW,
SCOTLAND, of the accomplishment of this SB and request the necessary revisions for the affected manuals.
M. Family Tree Of Modification Relationships Not applicable.
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:- For all aircraft after 31s of July 2013, at the next scheduled removal of the affected MLG (left or right).
NOTE: For Jetstream Series 3100 aircraft that are affected by inspection SB 32-A- JA851226, next scheduled MLG removal may be for NDT inspection or overhaul.
NOTE: For Jetstream Series 3100 aircraft that are not affected by inspection SB 32-A- JA851226, next scheduled MLG removal would be for overhaul.
NOTE: For Jetstream Series 3200 aircraft, next scheduled MLG removal would be for overnaul.
The technical content of this SB is approved under the authority of EASA PART 21 Approval No. EASA.21J.047.
Signed Date 7/5/13 EASA Part 21 Approval No. EASA.21J.047.
ORIGINAL ISSUE: 8th April 2013 32-JM7862 REVISION 1: 7th May 2013 PAGE 3
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.
BRITISH AEROSPACE
JETSTREAM SERIES 3100 & 3200
SERVICE BULLETIN FWD
REAR SPAR DATUM
SPECIAL WASHER 13744B31
LEFT HAND SHOWN
RIGHT HAND OPPOSITE SPLIT
BEARING 13744B29
FORWARD
SPIGOT REMOVE MATERIAL FROM BEARING
HOUSING BORE WASHER TO MATCH JOURNAL (SHOWN DOTTED) SPIGOT HOUSING BORE SECTION 'C-C' (REF) SECTION 'C-C' PRE MOD JM5218 POST MOD JM5218
WASHER OMMITED FOR CLARITY WASHER OMMITED FOR CLARITY J3210019
INSTALLATION OF SPECIAL WASHER AND NEW BEARING FIGURE 1 32-JM7862 ORIGINAL ISSUE: 8th April 2013 PAGE 10 REVISION 1: 7th May 2013
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