Airworthiness Directive · Amendment 39-17011 · Fuselage
Fokker Services B.V. Airplanes
This AD applies to Fokker Services B.V. Model F.27 Mark 050 airplanes; certificated in any category; serial numbers 20103 through 20252 inclusive, 20254 through 20267 inclusive, 20270 through 20279 inclusive, 20281, 20283 through 20286 inclusive, 20288 through 20317 inclusive, 20328, 20331, 20333, and 20335; except those that have already been modified in accordance with Fokker Service Bulletin SBF50-53-062.
We are adopting a new airworthiness directive (AD) for certain Fokker Services B.V. Model F.27 Mark 050 airplanes. This proposed AD would require performing a low frequency eddy current inspection for cracks of the lap joint of the rear fuselage, and repair if necessary. This AD was prompted by reports of cracking in the fuselage lap joint. We are issuing this AD to detect and correct exponential crack growth, which could lead to failure of the lap joint over a certain length and consequent in-flight decompression of the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within the applicable times specified in paragraphs (g)(1), (g)(2), or (g)(3) of this AD: Do a low frequency eddy current (LFEC) inspection for cracks of the lap joint of the rear fuselage, in accordance with the Accomplishment Instructions of Fokker Service Bulletin SBF50-53-061, dated January 13, 2011.
(1) For airplanes that have accumulated 47,000 total flight cycles or more as of the effective date of this AD: Within 3 months after the effective date of this AD.
(2) For airplanes that have accumulated more than 46,000 total flight cycles but less than 47,000 total flight cycles as of the effective date of this AD: Within 6 months after the effective date of this AD.
(3) For airplanes that have accumulated more than 45,000 total flight cycles but less than or equal to 46,000 total flight cycles as of the effective date of this AD: Within 12 months after the effective date of this AD.
If any crack is found during the LFEC inspection required by paragraph (g) of this AD, before further flight, repair the lap joint in accordance with the Accomplishment Instructions of Fokker Service Bulletin SBF50-53-062, dated January 13, 2011.
Submit a report of the findings (both positive and negative) of the inspection required by paragraph (g) of this AD to Fokker Services B.V., Technical Services, in accordance with the instructions of Figure 6 of Fokker Service Bulletin SBF50-53-061, dated January 13, 2011, at the applicable time specified in paragraph (i)(1) or (i)(2) of this AD.
(1) If the inspection was done on or after the effective date of this AD: Submit the report within 30 days after the inspection.
(2) If the inspection was done before the effective date of this AD: Submit the report within 30 days after the effective date of this AD.
Repairing the lap joint in accordance with the Accomplishment Instructions of Fokker Service Bulletin SBF50-53-062, dated January 13, 2011, terminates the action required by paragraph (g) of this AD provided that the action is accomplished within the applicable compliance time specified in paragraph (g) of this AD.
