AIRWORTHINESS DIRECTIVE
CAA-AD-011/1999
Date of issue: February 08, 2000
AIRCRAFT - FLAP ASSEMBLIES - INSPECTION/REPLACEMENT BOLT AND BUSHING
Applicability: Aircraft Mfg. Serial No's SAAB SF340A -004 through -159 and SAAB 340 -160 through -459 with flap assy and serial numbers as below:
- 7257800-507 with Serial No 1258 through 1270
- 7257800-508 with Serial No 1257 through 1269
NOTE: NTD inspection according to Service Bulletin SAAB 340-57-037 must (for affected flap assemblies) be performed in conjunction with this SAD.
NOTE: The affected flap assemblies were at delivery from Saab installed on A/C Mfg. Serial No's SAAB 340B -367 through -379.
Spares: Flap assemblies P/N (if as spares):
7257800-507 with Serial No 1258 through 1270 and 7257800-508 with Serial No 1257 through 1269
Effective date: March 23, 2000
Compliance: Required as indicated in SAD No. 1-152.
Remarks: The compliance of this AD must be recorded in Aircraft Logbook, where applicable the requirements of this AD must be integrated into Aircraft Technical Documentation. Address inquiries concerning this AD to: Civil Aviation Authority, Airworthiness Division, Ruzyne Airport, 160 08 Prague 6, Czech Republic, tel: 420 2 33320922, fax: 420 2 20562270.
Ing. Pavel MATOUŠEK
Director of Airworthiness Division, CAA CZ
SWEDISH AIRWORTHINESS DIRECTIVES (SAD) No. 1-152
AIRCRAFT TYPE: SAAB SF340A and SAAB 340B
SERIAL No:s AFFECTED: Aircraft Mfg. Serial No's SAAB SF340A -004 through -159 and SAAB 340 -160 through -459 with flap assy and serial numbers as below:
- 7257800-507 with Serial No 1258 through 1270
- 7257800-508 with Serial No 1257 through 1269
NOTE: NTD inspection according to Service Bulletin SAAB 340-57-037 must (for affected flap assemblies) be performed in conjunction with this SAD.
NOTE: The affected flap assemblies were at delivery from Saab installed on A/C Mfg. Serial No's SAAB 340B -367 through -379.
Spares: Flap assemblies P/N (if as spares):
7257800-507 with Serial No 1258 through 1270 and 7257800-508 with Serial No 1257 through 1269
SUBJECT: Wings - Flaps - Identification and for affected Flaps, Inspection and Replacement of Bolt and Bushing Installation at WS 123.38
BACKGROUND: Some discrepancies have been found in the flap bushing/ bolt installation at WS 123.38. This was most likely caused when implementing Service Bulletin 340-57-027 (Wing - Flaps - Inspection & Modification/Replacement of fittings at WS 123.38) on A/C Mfg. Serial No's 340B -367 through -379.
Bushings with incorrect length may have been installed at the fwd attachment point to the triangular fitting. In similarity with this, bolt and bushings with incorrect lengths may also have been installed at the aft attachment point. Consequently, high bearing stress can occur to the bushings and on the L-fittings due to short bushings and bolts.
High bearing stresses may lead to:
- Worn bushings
- Elongated holes
- Vibrations
- Cracked flap fittings which in worst case can lead to jammed flaps.
REFERENCE DOCUMENTS: Saab Aircraft AB Mandatory Service Bulletin SAAB 340-57-035 dated 18 January, 2000
ACTIONS: Perform actions described in Saab Aircraft AB Mandatory Service Bulletin SAAB 340-57-035 dated 18 January, 2000 or later revision
COMPLIANCE TIME: Identification of the flap assemblies installed on the aircraft and for affected flap assemblies, visual inspection to be performed within 800 flight hours from effective date of this SAD.
- If any visible crack is found at the flap fittings, replace the flap fittings (Refer to Service Bulletin 340-57-038)
- If no crack is found, repeat the visual inspection every 800 flight hours until the inspection according to Para 2.C. in Service Bulletin SAAB 340-57-035 and replacement of bolts and bushings is performed.
Replacement to be performed within 4800 flight hours from effective date of this SAD.
EFFECTIVE DATE: 19 January, 2000