AD 2007-02-16

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.

For generators overhauled in accordance with Maintenance Review Board (MRB) Task 243104: Before 800 flight hours since last overhaul, or within 100 flight hours after April 1, 2005 (the effective date of AD 2005-04-12), perform a general visual inspection for wear of the DC starter generator brushes and leads, in accordance with Saab Service Bulletin 340-24-035, dated July 5, 2004.

Note 1: For the purposes of this AD, a general visual inspection is: “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 from within touching distance unless otherwise specified. A mirror may be necessary to ensure visual access to all surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or droplight 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.”

Note 2: Saab Service Bulletin 340-24-035, dated July 5, 2004, references Goodrich Service Information Letter 23080-03X-24-01, dated July 1, 2004, as an additional source of service information.

(1) If the tops of the brush sets are above the top of the brush box, repeat the inspection thereafter at intervals not to exceed 800 flight hours until paragraph (i) of this AD is done.

(2) If the tops of the brush sets are below the top of the brush box, before further flight, measure the brushes and determine the amount of brush life remaining, in accordance with the service bulletin.

(i) If the brush wear is within the limits specified in the service bulletin, repeat the inspection thereafter at intervals not to exceed 800 flight hours until paragraph (i) of this AD is done.

(ii) If the brush wear is outside the limits specified in the service bulletin, before further flight, replace the starter generator with a new or serviceable starter generator, in accordance with the service bulletin.

For generators overhauled in accordance with MRB Task 243104: Before 800 flight hours since last overhaul, or within 100 flight hours after April 1, 2005, whichever occurs later, perform a general visual inspection of each leading wafer brush for loose rivets, in accordance with Saab Service Bulletin 340-24-035, dated July 5, 2004. Repeat the inspection thereafter at intervals not to exceed 800 flight hours until paragraph (i) of this AD is done. If any rivet is loose, before further flight, replace the DC starter generator with a new or serviceable starter generator, in accordance with the service bulletin.

For generators overhauled or with brush replacement accomplished in accordance with MRB Task 243103 or 243101, no action is required by paragraphs (f) and (g) of this AD.

(i) For all generators: Within 36 months after the effective date of this AD, install new improved generator control units (GCUs) in accordance with the Accomplishment Instructions of Saab Service Bulletin 340-24-026, Revision 03, dated December 20, 2004. Installing the GCUs terminates the repetitive inspection requirements of paragraphs (f) and (g) of this AD.