Airworthiness directives › 2004-22-21
AD 2004-22-21 Airworthiness Directives; GROB-WERKE Model G120A Airplanes
Models named: G120A. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
(c) This AD affects Model G120A airplanes, all serial numbers, that are certificated in any category.
Required actions
(e) To address this problem, you must do the following: Actions Compliance Procedures (1) Inspect the area between the vertical stabilizer main spar and the nearby vertical stabilizer skin for any disbonding/crack along the spar/skin contact (both sides of the vertical stabilizer) Within the next 50 hours time-in-service (TIS) after December 27, 2004 (the effective date of this AD), unless already done. Repetitively inspect thereafter at every 50 hours TIS Follow GROB Luft-und Raumfahrt Service Bulletin No. MSB 1121-049, dated April 20, 2004. The applicable airplane maintenance manual also addresses this issue. (2) If any disbonding/crack is found during any inspection required by paragraph (e)(1) of this AD: (i) Get a repair instruction from the manufacturer; and (ii) Follow this repair instruction. (iii) The repetitive inspections of paragraph (e)(1) of this AD are still required after any repair. Before further flight after any inspection required by paragraph (e)(1) of this AD where any disbonding/crack is found Follow GROB Luft-und Raumfahrt Service Bulletin No. MSB1121-049, dated April 20, 2004; and any repair instruction obtained from GROB Luft-und Raumfahrt, Lettenbachstrasse 9, D-86874 Tussenhausen-Mattsies, Federal Republic of Germany; telephone: 011 49 8268 998139; facsimile: 011 49 8268 998200. Obtain approval of this repair instruction through the FAA at the address specified in paragraph (f) of this AD. The applicable airplane maintenance manual also addresses this issue. (3) Calculate weight and balance after any repair required by paragraph (e)(2) of this AD Before further flight after any repair required by paragraph (e0(2) of this AD Follow GROB Luft-und Raumfahrt Service Bulletin No. MSB1121-049, dated April 20, 2004. The applicable airplane maintenance manual also addresses this issue.
Unsafe condition
(d) This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified in this AD are intended to detect and correct any disbonding/crack in the area between the vertical stabilizer main spar and nearby stabilizer skin, which could result in possible structural failure. This failure could lead to difficulty in airplane flight control.
Affected ADs
(b) None.
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1