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SAAB 2000 Service Bulletin ATA CHAPTER: 32
LANDING GEAR - ANTI-SKID - COLOR MARKING OF THE ANTI-SKID/WHEEL SPEED
TRANSDUCER HARNESSES AND THE WHEEL AXLES Mod No. 6661
1. PLANNING INFORMATION A. EFFECTIVITY
(1) Aircratt:
Aircraft Mfg. Serial No's SAAB 2000 - 004 thru - 063.
(2) Spares:
MLG Shock Strut Assemblies P/N: AIR83078, AIR83084 and AIR83132.
Anti-Skid Harness Sub-Assemblies P/N: AIR134484 and AIR134485.
NOTE: For modification of spares, refer to Para. 2.D.
B. REASON It has been found possible to connect inboard anti-skid/wheel speed transducer harness (the harness) to the outboard anti-skid system channel and vice versa in the wheel axle on the main landing gear. In case the harnesses are cross-connected, there will be a significant reduction in braking capabilities if the anti-skid function is activated as the system will receive incorrect inputs.
This Service Bulletin introduces color marking of the harnesses and the wheel axles.
Implementation of this Service Bulletin will reduce the possibility to cross-connect the harnesses and thus eliminate the risk for reduction in braking capabilities.
For additional information, refer to Safety recommendation A-21-55 in NTSB investigation report AAR-21-05.
C. DESCRIPTION This Service Bulletin gives instructions for:
- Removal of the main wheels
- Removal of the wheel speed transducers
- Modification of the LH and RH main landing gear:
- Color marking of the harnesses
- Color marking the wheel axles
- Installation of the wheel speed transducers
- Installation of the main wheels
- Functional test to make sure that the harnesses are correctly installed
- If applicable, modification of spares.
D. COMPLIANCE Mandatory.
Saab recommends this Service Bulletin to be performed within 12 months or 1500 flight hours, whichever comes first, from release of this Service Bulletin.
This Service Bulletin is under EASA consideration for an Airworthiness Directive.
The final compliance terms will be set by the EASA Airworthiness Directive (AD) when issued.
04 May 2023 2000-32-084 Revision 01, 15 May 2023 Page 1 ot 8
SAAB 2000 Service Bulletin E. APPROVAL The technical content of this Service Bulletin is approved under the authority of the DOA ref.
EASA.21J.066.
F. MANPOWER Estimated time to complete this Service Bulletin is:
2 persons required.
Total manhours: 10 Elapsed time (hours): 5 Labour cost at operators expense.
G. MATERIAL - COST AND AVAILABILITY Refer to Attachment 1, 2 or 3 (HD SB AIR83078-32-12, AIR83084-32-13 or AIR83132-32-03).
H. TOOLING Refer to Attachment 1, 2 or 3 (HD SB AIR83078-32-12, AIR83084-32-13 or AIR83132-32-03).
I. WEIGHT AND BALANCE None.
J. ELECTRICAL LOAD DATA Not affected.
K. REFERENCES Aircraft Maintenance Manual (AMM) 07-10-00-582-807 07-10-00-582-808 32-12-00-010-801 32-12-00-410-801 32-41-10-000-801 32-41-10-400-801 32-43-17-400-801 32-43-20-000-801 32-43-20-400-801 32-43-25-000-801 32-43-25-400-801 Wiring Diagram Manual (WDM) 20-20-05 HD Service Bulletin AIR83078-32-12 (Attachment 1) AIR83084-32-13 (Attachment 2) AIR83132-32-03 (Attachment 3).
L. OTHER PUBLICATIONS AFFECTED Aircraft Maintenance Manual (AMM) Illustrated Parts Catalog (IPC) 04 May 2023 2000-32-084 Revision 01, 15 May 2023 Page 2 of 8
SAAB 2000 Service Bulletin
2. ACCOMPLISHMENT INSTRUCTIONS A. JOB SET-UP
(1) Before you start the SB, make sure:
- The modification kit contains the parts listed in the Service Bulletin
- The material listed in the HD Service Bulletins (Attachment 1, 2 and 3) are available
- The documentation is available.
(2) Open the forward doors of the main landing gear (Ref. AMM TASK 32-12-00-010-801).
(3) Do a functional test and make sure that the anti-skid harnesses are correctly installed on the LH and RH landing gear Ref. AMM TASK 32-43-17-400-801, Subtask 32-43-17-720-001.
(4) Open the circuit breakers.
(a) On the LH circuit breaker panel 9VU, open and tag the circuit breakers:
LABEL POS C/B HYDRAULIC A-SKID INBD F-10 1GG HYDRAULIC L LDG CTL F-11 13GA
(b) On the RH circuit breaker panel 10VU, open and tag the circuit breaker:
LABEL POS C/B HYDRAULIC A-SKID OUTBD M-8 2GG HYDRAULIC R LDG CTL M-9 16GA
(5) Lift the aircraft on the three main jacks (Ref. AMM TASK 07-10-00-582-807).
(6) Remove the main wheel hubcaps (Ref. AMM TASK 32-43-25-000-801).
(7) Remove the main wheel nuts (Ref. AMM TASK 32-41-10-000-801).
(8) Remove the wheel speed transducers (Ref. AMM TASK 32-43-20-000-801). Ensure to retain the wheel speed transducer harnesses to stop them from recoiling into the main wheel axles.
(9) Clean the upper part of the anti-skid harnesses and the connectors.
(a) Cover the lower part of the LH and RH MLG with a protective cover.
Use a mild detergent and clean the upper part of the anti-skid harnesses and the connectors 5GA/6GA-P4/P5.
B. MODIFICATION
(1) Modify the LH landing gear REF. FIG. 1 and Attachment 1, 2 or 3)
(a) Modify the outboard side of the LH landing gear.
Modify the upper part of the harness.
Disconnect connector 5GA-P5, of LH side harness (AIR134485) from the LH nacelle.
Do a connection checkout of the LH side harness (upper and lower connector) (Ref. WDM 20-20-05). This is to make sure that correct harness is modified.
Position heat shrink RN-3000-24/8-4 (YELLOW) to LH harness (AIR134485), as illustrated in Attachment 1, 2 or 3, Figure 2 (END "B"). Using heat gun apply heat to the heat shrink to retain in position.
04 May 2023 2000-32-084 Revision 01, 15 May 2023 Page 3 of 8
SAAB 2000 Service Bulletin d Connect the connector 5GA-P5, of LH harness (AIR134485) to the LH nacelle.
2 Modify the lower part of the harness and the axle.
a Position the heat shrink RNF-3000-24/8-4 (YELLOW) to the LH harness (AIR134485), as illustrated in Attachment 1, 2 or 3, Figure 2 (END "A"). Use a heat gun and apply the heat to the heat shrink to retain in position.
Use the 400 grade abrasive paper or fine grade Scotch-brite. Lightly abrade the LH outboard diameter of the axle to smooth any rough edges to a feather finish.
Care must be taken not to damage the corrosion protection layer.
Thoroughly clean the LH outboard diameter of the axle, use a suitable cleaning solvent with a clean lint free cloth made moist with solvent. Allow area to dry Paint the LH plain section of the outboard diameter of the axle up to the thread, where indicated in Attachment 1, 2 or 3, Figure 4, using Humbrol enamel gloss paint color code No. 69 - Yellow (Alt. Revell enamel gloss color code No. 12 - Let the paint air-dry for 24 hours.
(b) Modify the inboard side of the LA landing gear.
Modify the upper part of the harness.
Disconnect connector 5GA-P4, of RH side harness (AIR134484) from the LH nacelle.
Position heat shrink RN-3000-24/8-5 (GREEN) to RH harness (AIR134484), as illustrated in Attachment 1, 2 or 3, Figure 2 (END "B"). Using heat gun apply heat to the heat shrink to retain in position.
Connect the connector 5GA-P4, of RH harness (AIR134484) to the LH nacelle.
2 Modity the lower part of the harness and the axle.
Position heat shrink RNF-3000-24/8-5 (GREEN) to RH harness (AIR134484), as illustrated in Attachment 1, 2 or 3, Figure 2 (END "A"). Using heat gun apply heat to the heat shrink to retain in position.
Using 400 grade abrasive paper or fine grade Scotch-brite. Lightly abrade the LH outboard diameter of axle to smooth any rough edges to a feather finish.
Care must be taken not to damage the corrosion protection layer.
Thoroughly clean RH outboard diameter of axle, using a suitable cleaning solvent with clean lint free cloth made moist with solvent. Allow area to dry fully.
Paint the RH plain section of the outboard diameter of the axle up to the thread, where indicated in Attachment 1, 2 or 3, Figure 4, using Humbrol enamel gloss paint color code No. 38 - Lime Green (Alt. Revell enamel gloss color code No.
61 - emerald Green).
e Let the paint air-dry for 24 hours.
(2) Modify the RH landing gear.
REF. FIG. 1 and Attachment 1, 2 or 3)
(a) Modify the inboard side of the RH landing gear.
Modify the upper part of the harness.
Disconnect the connector 6GA-P5, of LH side harness (AIR134485) from the RH nacelle.
Do a connection checkout of the LH side harness (upper and lower connector) (Ref. WDM 20-20-05). This is to make sure that correct harness is modified 04 May 2023 2000-32-084 Revision 01, 15 May 2023 Page 4 of 8
SAAB 2000 Service Bulletin Position heat shrink RN-3000-24/8-4 (YELLOW) to LH harness (AIR134485), as illustrated in Attachment 1, 2 or 3, Figure 2 (END "B"). Using heat gun apply heat to the heat shrink to retain in position.
d Connect the connector 6GA-P5, of LH harness (AIR134485) to the RH nacelle.
2 Modify the lower part of the harness and the axle.
Position heat shrink RNF-3000-24/8-4 (YELLOW) to LH harness (AIR134485), as illustrated in Attachment 1, 2 or 3, Figure 2 (END "A"). Using heat gun apply heat to the heat shrink to retain in position.
Using 400 grade abrasive paper or fine grade Scotch-brite. Lightly abrade the LH outboard diameter of axle to smooth any rough edges to a feather finish.
Care must be taken not to damage the corrosion protection layer.
Thoroughly clean LH outboard diameter of axle, using a suitable cleaning solvent with clean lint free cloth made moist with solvent. Allow area to dry fully.
Paint the LH plain section of the outboard diameter of the axle up to the thread, where indicated in Attachment 1, 2 or 3, Figure 4, using Humbrol enamel gloss paint color code No. 69 - Yellow (Alt. Revell enamel gloss color code No. 12 - Let the paint air-dry for 24 hours.
(b) Modify the outboard side of the RH landing gear.
1 Modity the upper part of the harness.
Disconnect the connector 6GA-P4, of RH side harness (AIR134484) from the RH nacelle.
Position heat shrink RN-3000-24/8-5 (GREEN) to RH harness (AIR134484), as illustrated in Attachment 1, 2 or 3, Figure 2 (END "B"). Using heat gun apply heat to the heat shrink to retain in position.
Connect the connector 6GA-P4, of RH harness (AIR134484) to the RH nacelle.
Modify the lower part of the harness and the axle.
Position heat shrink RNF-3000-24/8-5 (GREEN) to RH harness (AIR134484), as illustrated in Attachment 1, 2 or 3, Figure 2 (END "A"). Using heat gun apply heat to the heat shrink to retain in position.
Using 400 grade abrasive paper or fine grade Scotch-brite. Lightly abrade the LH outboard diameter of axle to smooth any rough edges to a feather finish.
Care must be taken not to damage the corrosion protection layer.
Thoroughly clean RH outboard diameter of axle, using a suitable cleaning solvent with clean lint free cloth made moist with solvent. Allow area to dry fully.
Paint the RH plain section of the outboard diameter of the axle up to the thread, where indicated in Attachment 1, 2 or 3, Figure 4, using Humbrol enamel gloss paint color code No. 38 - Lime Green (Alt. Revell enamel gloss color code No.
61 - emerald Green).
e Let the paint air-dry for 24 hours.
C. JOB CLOSE-UP
(1) Install the LH and RH side wheel speed transducers (Ref. AMM TASK 32-43-20-400-801).
(2) Install the LH and RH side main wheel nuts (Ref. AMM TASK 32-41-10-400-801).
(3) Install the main wheel hubcaps (Ref. AMM TASK 32-43-25-400-801).
04 May 2023 2000-32-084 Revision 01, 15 May 2023 Page 5 of 8
SAAB 2000 Service Bulletin
(4) Lower the aircraft and remove the three main jacks (Ref. AMM TASK 07-10-00-582-808).
(5) Close the circuit breakers.
(a) On the LH circuit breaker panel 9VU, remove the tag and close the circuit breakers:
LABEL POS C/B HYDRAULIC A-SKID INBD F-10 1GG HYDRAULIC L LDG CTL F-11 13GA
(b) On the RH circuit breaker panel 10VU, remove the tag and close the circuit breaker:
LABEL POS C/B HYDRAULIC A-SKID OUTBD M-8 2GG HYDRAULIC R LDG CTL M-9 16GA
(6) Do a functional test and make sure that the anti-skid harnesses are correctly installed on the LH and RH landing gear Ref. AMM TASK 32-43-17-400-801, Subtask 32-43-17-720-001.
(7) Close the forward doors of the main landing gear (Ref. AMM TASK 32-12-00-410-801).
(8) Remove all the tools and the equipment from the work area. Make sure the work area is clean.
D. MODIFICATION - SPARES
(1) For MLG shock strut assemblies and anti-skid harnesses held as spares, do the color coding modification (Ref. Attachment 1, 2 or 3 (HD SB AIR83078-32-12, AIR83084-32-13 or AIR83132-32-03).
04 May 2023 2000-32-084 Revision 01, 15 May 2023 Page 6 of 8
SAAB 2000 Service Bulletin
3. MATERIAL INFORMATION A. Material Refer to Attachment 1, 2 or 3 (HD SB AIR83078-32-12, AIR83084-32-13 or AIR83132-32-03).
B. Local Supply:
Item Part Number Qty Nomenclature Designation Remarks A/R Protective Cover LH/RH MLG Polyethylene film or equivalent.
A/R Mild detergent 04 May 2023 2000-32-084 Revision 01, 15 May 2023 Page 7 of 8
SAAB 2000 Service Bulletin (REF GA-P5) YELLOW AIR134485 (REF GA-P4) GREEN AIR134484 6GA-P4 GREEN 6GA-P5 YELLOW 5GA-P4 GREEN 5GA-P5 YELLOW
RH NACELLE
LH NACELLE (REF GA-P5) YELLOW AIR134485 AIR134484- (REF GA-P4) GREEN B-00574 Color Marking of the Anti-Skid Harnesses and the Wheel Axles FIG. 1 04 May 2023 2000-32-084 Revision 01, 15 May 2023 Page 8 of 8