Airworthiness Directive · Amendment 39-13849 · GROB-WERKE Model G120A Airplanes

AD 2004-22-21

GROB-WERKE Model G120A Airplanes

Mentions a repeat actionAirplane

Published: November 4, 2004
Effective: December 27, 2004
Maker: Grob-Werke
Supersedes: Nothing

Applies to

This AD affects Model G120A airplanes, all serial numbers, that are certificated in any category.

The FAA's summary

The FAA adopts a new airworthiness directive (AD) for all GROB-WERKE (GROB) Model G120A airplanes. This AD requires you to repetitively inspect visually the area between the vertical stabilizer main spar and the nearby vertical stabilizer skin for any disbonding/ crack; repair any disbonding/crack found; and calculate weight and balance after any repair. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. We are issuing this AD 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.

What it requires

What Must I Do To Address This Problem?

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.

Official sources

The Federal Register document · document 04-24522, the legal text
FAA Dynamic Regulatory System (DRS) · search 2004-22-21 for its current status and any corrections

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.