Airworthiness directives › 2004-11-12
AD 2004-11-12 Airworthiness Directives; Alexander Schleicher Model ASW 27 Sailplanes
Applicability*9
(c) This AD affects the following Alexander Schleicher Model ASW 27 sailplanes that are certificated in any category: Serial numbers Condition (1) 27105, 27109, 27110, 27113, 27115, 27116, and 27119 through 27177 Equipped with integrated (wet inner surface) water ballast tanks on the wing at manufacture. (2) 27001 and up Equipped with integrated (wet inner surface) water ballast tanks through wing replacement per Technical Note No. 2.
Required actions
(e) To address this problem, you must do the following: Actions Compliance Procedures (1) Fabricate (using letters at least 1/8-inch in height) a warning placard with the following language and install this placard in the cockpit in full view of the pilot: “When water ballast is used, pilots weighing 105 kg (231.5 lbs) or more including parachute must use the rearmost back rest hinge position!” Warning placard must be installed within 25 hours time-in-service (TIS) after July 27, 2004 (the effective date of this AD) Install placard following Alexander Schleicher Technical Note No. 9, dated February 27, 2002. (2) Determine the forward empty weight CG (i) If the CG is out of acceptable range, prior to further flight, contact the manufacturer at Alexander Schleicher GmbH & Co., Seglflugzeugbau, D-36163 Poppenhausen, Germany for corrective action and perform the corrective action. (ii) If CG is within acceptable range, no further action is necessary. Within the next 50 hours TIS after July 27, 2004 (the effective date of this AD) Check forward empty weight of CG following Alexander Schleicher Technical Note No. 9, dated February 27, 2002. Note: Alexander Schleicher Technical Note No. 9, dated February 27, 2002, changes some pages to the maintenance manual. We recommend that you review those changes.
Unsafe condition
(d) This AD is the result of water ballast in the integral wing water ballast tanks that may cause a stronger nose heavy moment than the soft water ballast bags, putting the center-of-gravity (CG) out of acceptable range. To compensate for this, pilots over a certain weight must only use the rearmost backrest position. The actions specified in this AD are intended to correct the forward empty weight CG and prevent loss of sailplane control.
Affected ADs
(b) None.
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