Division Piper PA-38 (Tomahawk) Series Aeroplanes - AD/PA-38/7 Amdt 6 - Fin Forward Spar Attachment - Inspection, Modification and Life Limit - Piper PA-38 (Tomahawk) Series Aeroplanes

Piper PA-38 (Tomahawk) Series Aeroplanes

AD/PA-38/7 Amdt 6	Fin Forward Spar Attachment - Inspection, Modification and Life Limit	13/2008

Applicability:	All model PA-38-112 with S/Nos. 38-78A0001 to 38-80A0198.
Requirement:	1. Gain access to vertical fin forward spar attachment plate P/N 77553-05 by removing lower fin fairing. Visually inspect for signs of movement, cracking and/or clamping witness marks in vicinity of fin forward spar attachment to fuselage.2. Remove vertical fin and using a dye penetrant method inspect for cracks in:(a) Fin forward spar in vicinity of attachment plate P/N 77553-05.(b) Cancelled.(c) Front and rear faces of bulkhead P/N 77553-02 in vicinity of rivets that attach plate P/N 77553-05 and adjacent flange radius.3. Replace the fin forward spar attachment plate, Piper P/N 77553-05.Note: Piper SB 745 Parts I, II and III; and FAA AD 82-27-08(a)(1), (a)(2) and (a)(4) refer.
Compliance:	1 and 2(a). For aircraft which do not incorporate forward fin spar modification kit Piper P/N 764427 or CASA-approved repair scheme Drg. 01-B-422 and AV-157-02 inspect at each scheduled maintenance event for the issue of a maintenance release.2(c). For aircraft which do not incorporate fuselage bulkhead assembly P/N77553-06 or CASA-approved repair scheme Drg. 01-B-422 and AV-157-02 inspect at intervals not exceeding 300 hours time in service.3. For aircraft which do not incorporate CASA-approved repair scheme Drg.01-B-422 and AV-151-02 replace fin forward spar attachment plates at intervals not exceeding 3000 hours time in service; orfor aircraft which incorporate CASA-approved repair scheme Drg. 01-B-422 andAV-151-02, replace fin forward spar attachment plates at intervals not exceeding 5000 hours time in service.

Applicability:

All model PA-38-112 with S/Nos. 38-78A0001 to 38-80A0198.

Requirement:

1. Gain access to vertical fin forward spar attachment plate P/N 77553-05 by removing lower fin fairing. Visually inspect for signs of movement, cracking and/or clamping witness marks in vicinity of fin forward spar attachment to fuselage.2. Remove vertical fin and using a dye penetrant method inspect for cracks in:(a) Fin forward spar in vicinity of attachment plate P/N 77553-05.(b) Cancelled.(c) Front and rear faces of bulkhead P/N 77553-02 in vicinity of rivets that attach plate P/N 77553-05 and adjacent flange radius.3. Replace the fin forward spar attachment plate, Piper P/N 77553-05.Note: Piper SB 745 Parts I, II and III; and FAA AD 82-27-08(a)(1), (a)(2) and (a)(4) refer.

Compliance:

1 and 2(a). For aircraft which do not incorporate forward fin spar modification kit Piper P/N 764427 or CASA-approved repair scheme Drg. 01-B-422 and AV-157-02 inspect at each scheduled maintenance event for the issue of a maintenance release.2(c). For aircraft which do not incorporate fuselage bulkhead assembly P/N77553-06 or CASA-approved repair scheme Drg. 01-B-422 and AV-157-02 inspect at intervals not exceeding 300 hours time in service.3. For aircraft which do not incorporate CASA-approved repair scheme Drg.01-B-422 and AV-151-02 replace fin forward spar attachment plates at intervals not exceeding 3000 hours time in service; orfor aircraft which incorporate CASA-approved repair scheme Drg. 01-B-422 andAV-151-02, replace fin forward spar attachment plates at intervals not exceeding 5000 hours time in service.

	This Amendment becomes effective on 18 December 2008.
Background:	Amendment 5 relieved some of the repetitive inspections in the area of the fin forward spar attachment. For aircraft with the CASA-approved reinforcement, repeat replacement of the fin forward spar attachment plate was extended to 5000 hours reflecting similarity with SB 710.Amendment 6 cancels requirement 2(b) based on a once-only inspection in Piper SB No. 628A and USA AD 78-26-06 which were only applicable to aircraft with serial numbers through to 38-78A0749. At requirement 2 (c), amendment 6 gives credit for fuselage bulkhead assembly P/N 77553-06 to match USA AD 82-27-08 (a)(2). Amendment 6 also changes the reference from USA AD 81-04-07 to 82-27-08.

This Amendment becomes effective on 18 December 2008.

Background:

Amendment 5 relieved some of the repetitive inspections in the area of the fin forward spar attachment. For aircraft with the CASA-approved reinforcement, repeat replacement of the fin forward spar attachment plate was extended to 5000 hours reflecting similarity with SB 710.Amendment 6 cancels requirement 2(b) based on a once-only inspection in Piper SB No. 628A and USA AD 78-26-06 which were only applicable to aircraft with serial numbers through to 38-78A0749. At requirement 2 (c), amendment 6 gives credit for fuselage bulkhead assembly P/N 77553-06 to match USA AD 82-27-08 (a)(2). Amendment 6 also changes the reference from USA AD 81-04-07 to 82-27-08.

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