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BAE SYSTEMS (Operations) Limited, Prestwick International Airport, Ayrshire, KA9 2RW, Scotland.
INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT
TRANSMITTAL FOR INSPECTION SERVICE BULLETIN REVISION SERVICE BULLETIN No.ISB.21-162 DATE: 07-JUN-2010 TITLE: AIR CONDITIONING - INSPECTION FOR CRACKING OF SKIN AT FRONT AND REAR DISCHARGE VALVES.
REVISION: 4 DATE: 28-JAN-2015
ACTIONS
(1) Remove and discard Service Bulletin at revision 3.
(2) Insert Service Bulletin at revision 4.
REASONS FOR REVISION
(1) Effectivity extended to all AVRO 146-RJ Series aircraft (see para. 1.A. (1)).
(2) Internal visual inspection added (see para.1.C and para.2.C. (1)).
(3) Compliance requirements clarified for BAe 146 Series and AVRO 146-RJ Series aircraft (see para.1.D).
(4) Instruction added explaining what to do when no damage is found (see para.2.C.(2) and para.2.c.(3)).
(5) Alternative sealant added (see para.2.C.(3), para.2.G.(3) and para. 3.A. (1)).
(6) Editorial.
NO RETROSPECTIVE ACTION IS REQUIRED FOR AIRCRAFT THAT HAVE
PREVIOUSLY BEEN INSPECTED IN ACCORDANCE WITH THIS INSPECTION SERVICE BULLETIN AT REVISION 3 OR EARLIER.
Date: 07-JUN-2010 REVISION TRANSMITTAL SHEET ISB.21-162 Revision: 4 28-JAN-2015 Page 1 of 2 Printed in England
BAE SYSTEMS
INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT
TRANSMITTAL FOR INSPECTION SERVICE BULLETIN REVISION SERVICE BULLETIN No.ISB.21-162 This Page Is Intentionally Left Blank.
Date: 07-JUN-2010 REVISION TRANSMITTAL SHEET ISB.21-162 Revision: 4 28-JAN-2015 Page 2 of 2 Printed in England
BAE SYSTEMS (Operations) Limited/ 2RW, Scotland. Prestwick International Airport, Ayrshire,
INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT TITLE: AIR CONDITIONING - INSPECTION FOR CRACKING OF SKIN AT FRONT AND REAR DISCHARGE VALVES.
1.Planning information A. Effectivity
(1) Aircraft Aircraft affected by this inspection are defined below:- ALL BAe 146-100, 200, 300 and 301 Series.
ALL AVRO 146-RJ70, RJ85 and RJ100 Series.
Check the aircraft technical records for accomplishment of this inspection.
B. Reason Moisture ingress into the aluminium/sealant mixture between the water trap/air drier and the fuselage skin adjacent to the front and rear discharge valves has resulted in corrosion build-up. This build-up of corrosion has resulted in cracking of the fuselage skin.
C.Description This inspection bulletin details a visual inspection of the internal fuselage at the location of the water trap/air driers to determine if water trap/air driers are installed, and details an external Detailed Visual Inspection (DVI) for bulging, surface anomalies and cracking of the fuselage skin adjacent to the forward and rear discharge valve outlets. The bulletin also details the actions necessary to improve corrosion protection.
D. CompLiance The technical content of this Inspection Service Bulletin (ISB) is subject to EASA AIRWORTHINESS DIRECTIVE consultation.
NOTE: Aircraft that have accomplished para.2.C.(1) and para.2.C. (2) in accordance with this ISB at Revision 3 or earlier have accomplished the physical inspection and improved corrosion protection.
For all BAe 146 Series aircraft only One-off improved corrosion protection (by means of additional edge sealant) per para.2.C. (3) is to be accomplished at the next maintenance input or within 2 years of the issue date of Revision Date: 07-JUN-2010 ISB.21-162 Revision: 4 28-JAN-2015 Page 1 of 14 Printed in England
BAE SYSTEMS
INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT 3 of this bulletin, whichever is the earlier.
For all AVRO 146-RJ aircraft only Carry out a one-off physical inspection of the aircraft per para.2.C.(1) to confirm if water trap/air driers are installed at the next suitable maintenance input or within 12 months of the issue date of Revision 4 of this ISB, whichever is the earlier.
If water trap/air driers are not installed then no further inspection is required for this ISB.
If water trap/air driers are installed then carry out the external DVI per para.2.C. (2). If damage is found, carry out any skin repairs necessary in accordance with para.2.G.
If no damage is found carry out a one-off improved corrosion protection (by means of additional edge sealant) per para.2.C.(3) within 24 months of the issue date of Revision 4 of this ISB.
For all aircraft after the initial inspection, the external DVI defined ir ara.2.C.(2) must be repeated every 2 years. If terminating action defined in para.2.G is performed, then the requirement for repeat inspections is terminated. However, removing the water trap/air drier may damage the fuselage skin, therefore it is recommended that the terminating action should only be carried out if a BAE SYSTEMS approved repair to the skin under the water trap/air drier is required.
E. Approval The technical information contained in this document has been approved under the authority of EASA Part 21 Approval No.
EASA. 21J.047.
F Manpower 8 hours. This does not include time for sealant curing.
G.Materials - cost and availability Cost and Availability is by arrangement between the Operator and BAE SYSTEMS.
H. Tooling - cost and availability Cost and Availability is by arrangement between the Operator and BAE SYSTEMS.
Date: 07-JUN-2010 ISB.21-162 Revision: 4 28-JAN-2015 Page 2 of 14 Printed in England
BAE SYSTEMS
INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT I.Weight and balance No Effect.
J. References Aircraft Maintenance Manual (AMM) 20-10-01 and 21-30-31.
Structural Repair Manual (SRM) 53-00-00 and 53-00-12.
K.Publications affected Aircraft Maintenance Manual (AMM).
Structural Repair Manual (SRM).
L. Electrical load data Not applicable.
M.Software Accomplishment Summary Not applicable.
N.Aircraft noise levels Not applicable.
Date: 07-JUN-2010 ISB. 21-162 Revision: 4 28-JAN-2015 Page 3 of 14 Printed in England
BAE SYSTEMS
INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT This Page Is Intentionally Left Blank.
Date: 07-JUN-2010 ISB.21-162 Revision: 4 28-JAN-2015 Page 4 of 14 Printed in England
BAE SYSTEMS
INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT
2.Accomplishment instructions A. GeneraL
(1) The following abbreviations are used within this document:- AMM - Aircraft Maintenance Manual SRM - Structural Repair Manual
(2) Observe all WARNINGS and CAUTIONS appearing in the AMM referred to in this ISB.
B.Preparation
(1) Open, safety and tag the following circuit breaker(s):- Table 1.
PANEL LABEL/SERVICE GRID REF/ IDENT 211-50-30 Dump Ditch Motors F32 211-50-30 Man Pressn Ctrl C32
(2) Refer to AMM 21-30-31 page block 401 and Drawing 1 and locate the front and rear discharge valve outlets and water trap/air driers.
C. Inspection
(1) Perform a visual inspection of the internal fuselage at the location of the water trap/air driers in order to determine whether or not water trap/air driers are installed.
NOTE: If water trap/air driers are not installed then no NOTE: If the anked and in hose ready further inspections are required. If the water trap/air driers are installed they may have been blanked and the hoses removed. If the water trap/air driers are blanked then the water trap/air driers should be recorded as installed. Thereafter, carry out the external DVI of the fuselage skin adjacent to the discharge valve outlets in para.2.C.(2) and the one-off improved corrosion protection in para.2.C.(3).
(2) Perform an external DVI of the fuselage skin adjacent to the discharge valve outlets (one frame bay fore and aft, one stringer above and below) to check for bulging, surface anomalies and cracking.
Date: 07-JUN-2010 ISB.21-162 Revision: 4 28-JAN-2015 Page 5 of 14 Printed in England
BAE SYSTEMS
INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT If damage is found, go to para.2.G and perform the Terminating Action.
If no damage is found go to para.2.E or if this is the first inspection carry out the one-off improved corrosion protection in para.2.C.(3).
(3) Apply additional PR1422A-2, PR1764B-2 or PR1828B-1/2 edge sealant between the water trap/air drier and the fuselage skin to stop any moisture ingress between the water trap/air drier and the skin panel.
NOTE: The edge sealant must not contain aluminium.
If no damage is found go to para.2.E.
D.Test None.
E .Close up
(1) Remove tags and close the following circuit breaker (s):- Table 2.
PANEL LABEL/SERVICE GRID REF/ IDENT 211-50-30 Dump Ditch Motors F32 211-50-30 Man Pressn Ctrl C32
(2) Make certain work area is clean, and clear of tools and miscellaneous equipment.
F.Documentation
(1) Complete a copy of Inspection Report attached to this ISB and return by fax or mail.
OR Return all required Inspection Report details via e-mail.
G.Terminating Action
(1) Remove Water Trap/Air Drier NOTE: Removing the water trap/air drier should only be carried out as part of a BAE SYSTEMS approved repair.
Date: 07-JUN-2010 ISB.21-162 Revision: 4 28-JAN-2015 Page 6 of 14 Printed in England
BAE SYSTEMS
INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT
(a) Loosen the hose clamp securing the hose to the water trap/air drier and disconnect the hose from the water trap/air drier.
(b) Using a non-metallic spatula-type tool and taking care not to damage the aircraft skin, break the adhesion between the water trap/air drier and the aircraft skin and remove the water trap/air drier.
(2) Repair Aircraft Skin Refer to SRM 53-00-00 for allowable damage.
(a) If damage is allowable, repair as detailed in SRM 53-00-12 fig. 202.
NOTE: Make sure the pitching of the repair fasteners does not interfere with the separator re-installation.
(b) If damage is not allowable, contact BAE Systems for a suitable repair.
(3) Re-install Water Trap/Air Drier
(a) Taking care not to damage the aircraft skin, clean off all traces of old sealant from the water trap/air drier and aircraft skin using a suitable cleaning agent.
(b) Ensure the skin in the area beneath the water trap/air drier is free from protective treatment to allow for electrical conductivity.
(c) Bond water trap/air drier to aircraft skin using PR1764B-2 conductive sealant.
(d) Re-install water trap/air drier so that the angle is as large as possible to allow water to fall to drain.
(e) Check for adequate edge sealing once the drier is re-installed. Apply additional PR1422A-2, PR1764B-2 or PR1828B-1/2 edge sealant between the water trap/air drier and the fuselage skin to stop any moisture ingress between the water trap/air drier and the skin panel as required.
NOTE: The edge sealant must not contain aluminium.
(f) Refer to AMM 20-10-01 page block 1 and do an electrical bonding check.
(g) Attach the hose to the water trap/air drier and secure using hose clamp.
Date: 07-JUN-2010 ISB. 21-162 Revision: 4 28-JAN-2015 Page 7 of 14 Printed in England
BAE SYSTEMS
INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT
(h) Remove safety clips and tags and close the following circuit breakers:- Table 3.
PANEL LABEL/SERVICE GRID REF/IDENT 211-50-30 DUMP DITCH MOTORS F32 211-50-30 MAN PRESSN CTRL C32
(i) Make certain work area is clean, and clear of tools and miscellaneous equipment.
(j) Record accomplishment of terminating action in aircraft records.
Date: 07-JUN-2010 ISB.21-162 Revision: 4 28-JAN-2015 Page 8 of 14 Printed in England
BAE SYSTEMS
INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT FRAME 34 FRAME 23.
DISCHARGE VALVE (REF)
WATER TRAP
TYPICAL
B SIMILAR HOSE CLAMP
AIR DRIER
EDGE SEALANT (FREE OF ALUMINIUM POWDER) SHOULD BE APPLIED TO
COMPLETE THE SEAL BETWEEN THE AIR DRIER/WATER TRAP AND THE FUSELAGE SKIN
• WATER TRAP/AIR DRIER AND DISCHARGE VALVE MAY BE BLANKED, AND HOSE REMOVED.
B2116201
TYPICAL LOCATION OF WATER TRAP/AIR DRIERS DRAWING 1.
Date: 07-JUN-2010 ISB. 21-162 Revision: 4 28-JAN-2015 Page 9 of 14 Printed in England
BAE SYSTEMS
INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT This Page Is Intentionally Left Blank.
Date: 07-JUN-2010 ISB.21-162 Revision: 4 28-JAN-2015 Page 10 of 14 Printed in England