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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 Bulletin 32-A-JA140940.
TITLE: LANDING GEAR – INSPECTION OF MAIN LANDING GE AR SPECIAL WASHER INSTALLATION.
INSPECTION
No text on this page: it may be a figure. Open the PDF to see it.
ORIGINAL 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 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.
SERVICE BULLETIN 32-A-JA140940 ORIGINAL ISSUE: 3 rd October 2014
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 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 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
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
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 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 spig ot 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: 3 rd October 2014 32-A-JA140940
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 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, IF
APPLICABLE, A SCREEN BONDING CHECK BEFORE THE ASSEMBLY 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
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 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 migra tion, 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 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 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 housin g using 10X magnification and a bright light for evidence corrosion.
SERVICE BULLETIN ORIGINAL ISSUE: 3 rd October 2014 32-A-JA140940
(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 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 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 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 still intact.
SERVICE BULLETIN 32-A-JA140940 ORIGINAL ISSUE: 3 rd October 2014
(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 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 r ecords.
(2) Inform BAE Systems of the accomplishment of thi s SB using the Accomplishment Report attached.
BRITISH AEROSPACE
JETSTREAM SERIES 3100 & 3200
SERVICE BULLETIN FWD
REAR SPAR DATUM
SPECIAL WASHER
TAB FLUSH WITH
TOP OF CYLINDER,
NO VISIBLE GAP LEFT HAND SHOWN
RIGHT HAND OPPOSITE
ROTATED TAB BENT TAB VISIBLE GAP
CORRECT INSTALLATION OF SPECIAL
WASHER LOOKING OUTBOARD ON
LEFT HAND MLG FORWARD SPIGOT
UNACCEPTABLE INSTAI LATIONS OF SPECIAL
WASHER LOOKING OUTBOARD ON LEFT HAND
MAIN LANDING GEAR (MLG) FORWARD SPIGOT
WITNESS PAINT
OFFSET FROM CYLINDER (REF)
CENTRELINE
INSPECTION WINDOW
SPECIAL WASHER
• FORWARD SPIGOT (REF) C J3210022 Inspection of Main Landing Gear Special Washer Installation.
Figure 1 ORIGINAL ISSUE: 3rd October 2014 32-A-JA140940 PAGE 9
SERVICE BULLETIN 32-A-JA140940 ORIGINAL ISSUE: 3 rd October 2014