Airworthiness Directive · Amendment 39-11489 · Saab Model SAAB SF340A and SAAB 340B Series Airplanes
Saab Model SAAB SF340A and SAAB 340B Series Airplanes
Model SAAB SF340A series airplanes, serial numbers 004 through 159 inclusive; and Model SAAB 340B series airplanes, series number 160 through 459 inclusive; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Saab Model SAAB SF340A and SAAB 340B series airplanes, that requires repetitive inspections of the control quadrant for loose screws, and replacement of the control quadrant with a modified part, which constitutes terminating action for the repetitive inspections. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent the power levers from binding due to the backing out of screws that secure the solenoid bracket within the flight idle stop assembly, which could result in the malfunction of the flight idle stop mechanism and the override function, and the inability to move the power levers aft of flight idle.
Required as indicated, unless accomplished previously.
To prevent the power levers from binding due to the backing out of screws that secure the solenoid bracket within the flight idle stop assembly, which could result in the malfunction of the flight idle stop mechanism and the override function, and the inability to move the power levers aft of flight idle, accomplish the following:
Inspection
(a) Within 800 flight hours after the effective date of this AD, perform a borescopic inspection of the control quadrant for loose screws, in accordance with Saab Service Bulletin 340-76-043, Revision 01, dated July 29, 1999. If no loose screws are found, repeat the inspection thereafter at intervals not to exceed 800 flight hours, until the requirements of paragraph (c) are accomplished.
Note 2: Saab Service Bulletin 340-76-043, dated July 2, 1999, references Adams Rite Aerospace Service Letter General SL-01, dated April 6, 1999, as an additional source of service information to accomplish the inspection.
Note 3: Inspections and replacements accomplished prior to the effective date of this AD in accordance with Saab Service Bulletin 340-76-043, dated July 2, 1999, are considered acceptable for compliance with the applicable action specified in this amendment.
Corrective Action
(b) If any loose screw is found during any inspection performed in accordance with paragraph (a) of this AD, prior to further flight, replace the existing control quadrant with a modified control quadrant, or with a serviceable control quadrant that has been inspected and found to have no loose screws, in accordance with Saab Service Bulletin 340-76-043, Revision 01, dated July 29, 1999.
Terminating Action
(c) Within 8,000 flight hours or 6 years after the effective date of this AD, whichever occurs earlier: Replace the existing control quadrant with a modified control quadrant in accordance with Saab Service Bulletin 340-76-043, Revision 01, dated July 29, 1999. Such replacement constitutes terminating action for the repetitive inspections required by paragraph (a) of this AD.
Spares
(d) As of the effective date of this AD, no person shall install a control quadrant on any airplane, unless the quadrant has been modified, or has been inspected and found to have no loose screws, in accordance with the requirements of this AD.
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
