Airworthiness Directive · Amendment 39-15814 · Flight controls
BURKHART GROB LUFT-UND RAUMFAHRT GmbH & CO KG G103 Series Gliders
This AD applies to the following models and serial numbers (SNs) gliders, certificated in any category:
(1) G103 TWIN II, SNs 3730 through 3878;
(2) G103A TWIN II ACRO, SNs 3730 through 34078 (K);
(3) G103C TWIN III ACRO, SNs 34101 through 34203; and
(4) G 103 C TWIN III SL, SNs 35001 through 35051.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Unless already done, within 60 days after March 31, 2009 (the effective date of this AD), do the following actions following Grob Aerospace Service Bulletin No. MSB 315-76/1 and No. 869-27/1 (same document), dated June 23, 2008:
(1) Remove bolt LN9037-M6x60 from the airbrake bell crank 103B-4437 and install a new bolt LN9037-M6x60 with the new locking nut LN9348-M6 and torque the bolt to 6.4 Nm (4.7 lbs.ft).
(2) Inspect all parts of the airbrake bell crank including the attachment parts for any damage and, before further flight, replace any damaged parts.
(3) Inspect the airbrake locking force of the left-hand (LH) and right-hand (RH) wing using a spring balance. The force must be equal for the LH and RH wing (guidance value: 10 ± 2 daN, (22.5 ± 4.5 lbs)) and the locking must be clearly noticeable.
(4) Inspect the airbrake locking force at the operating lever in the front cockpit with the wings rigged. The guidance value is 10 ± 2 daN, (22.5 ± 4.5 lbs). It must not exceed 15-20 daN (33.7-45.0 lbs).
Note: This AD differs from the MCAI and/or service information as follows: No differences.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
