Airworthiness Directive · Amendment 39-11935 · Israel Aircraft Industries, Ltd., Model Astra SPX and 1125 Westwind Astra Series Airplanes
Israel Aircraft Industries, Ltd., Model Astra SPX and 1125 Westwind Astra Series Airplanes
Model Astra SPX and 1125 Westwind Astra series airplanes; certificated in any category; serial numbers 030, and 042 through 086 inclusive.
Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (b) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD), applicable to certain Israel Aircraft Industries, Ltd., Model Astra SPX and 1125 Westwind Astra series airplanes, that requires a one-time inspection of the position of the aileron autopilot servo and attachment arm; follow-on actions; and corrective actions, if necessary; and installation of a stopper angle on the servo bracket. This action is necessary to prevent the control link of the aileron autopilot servo from being driven overcenter, which could result in roll oscillations when the autopilot is engaged. This action is intended to address the identified unsafe condition.
To prevent the control link of the aileron autopilot servo from being driven overcenter, which could result in roll oscillations when the autopilot is engaged, accomplish the following:
(a) Within 50 flight hours after the effective date of this AD, perform a one-time general visual inspection of the aileron autopilot servo and attaching linkage to determine whether the attachment arm on the servo is in the correct position, in accordance with Astra (Israel Aircraft Industries Ltd.) Alert Service Bulletin 1125-27A-157, dated September 14, 1999.
(1) If the attachment arm is in the correct position, prior to further flight, install a stopper angle on the servo bracket in accordance with the alert service bulletin.
(2) If the attachment arm is in the incorrect position, prior to further flight, perform a general visual inspection to detect damage of the bellcrank arm, control link, and attachment arm, in accordance with the alert service bulletin. Prior to further flight after accomplishment of all applicable corrective actions specified by this paragraph, install a stopper angle on the servo bracket in accordance with the alert service bulletin.
(i) If no damage is detected, prior to further flight, reposition the attachment arm in accordance with the alert service bulletin.
(ii) If any damage is detected and the damage is within the limits specified by the alert service bulletin, prior to further flight, repair the damaged part in accordance with the alert service bulletin.
(iii) If any damage is detected and the damage exceeds the limits specified by the alert service bulletin, prior to further flight, replace the damaged part with a new part in accordance with the alert service bulletin.
Note 2: For the purposes of this AD, a general visual inspection is defined as: “A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or drop-light, and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.”
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.
Aircraft
