Airworthiness Directive · Amendment 39-16321 · Engine
Cessna Aircraft Company Model 525A Airplanes
This AD applies to Model 525A airplanes, serial numbers 0001 through 0244, that are certificated in any category.
We are adopting a new airworthiness directive (AD) to supersede AD 2009-24-13, which applies to certain Cessna Aircraft Company (Cessna) Model 525A airplanes. AD 2009-24-13 currently requires you to repetitively inspect the thrust attenuator paddle assemblies for loose and damaged fasteners and for cracks. AD 2009-24-13 also requires you to replace loose or damaged fasteners and replace cracked thrust attenuator paddles found during any inspection. Since we issued AD 2009-24-13, Cessna has developed new design thrust attenuator paddles and universal head rivets as terminating action for the repetitive inspections. Consequently, this AD would retain the requirements of AD 2009-24-13 until replacement of both thrust attenuator paddles and the eight countersunk fasteners with new design thrust attenuator paddles and universal head rivets. We are issuing this AD to detect and correct loose and damaged fasteners and cracks in the thrust attenuator paddles, which could result in in-flight departure of the thrust attenuator paddles. This failure could lead to rudder and elevator damage and result in loss of control.
To address this problem, you must do the following, unless already done:
| Actions | Compliance | Procedures |
|---|---|---|
| (1) Visually inspect the left and right thrust attenuator paddle assemblies to determine if there are any missing, loose, or damaged fasteners and to determine if there are any cracks in the paddle | Within the next 60 days after December 15, 2009 (the effective date retained from AD 2009-24-13) or within the next 30 hours time-in-service (TIS) after December 15, 2009 (the effective date retained from AD 2009-24-13), whichever occurs first. Repetitively thereafter inspect at intervals not to exceed 150 hours TIS | Follow Cessna Citation Alert Service Letter ASL525A-78-01, Revision 1, dated October 27, 2009. |
| (2) If you do not find any cracks in the thrust attenuator paddles during any inspection required in paragraph (f)(1) of this AD, install any missing fasteners, and replace any loose or damaged fasteners | Before further flight after the inspection required in paragraph (f)(1) of this AD. Continue with the repetitive inspections specified in paragraph (f)(1) of this AD | Follow Cessna Citation Alert Service Letter ASL525A-78-01, Revision 1, dated October 27, 2009. |
| (3) If cracks are found during any inspection required in paragraph (f)(1) of this AD, do a surface eddy current inspection of the thrust attenuator paddles and the fastener hole(s) to determine the length of the cracks(s) | Before further flight after the inspection required in paragraph (f)(1) of this AD in which cracks are found | Follow Cessna Citation Alert Service Letter ASL525A-78-01, Revision 1, dated October 27, 2009. |
| (4) If the cracks identified in paragraph (f)(3) of this AD meet or exceed the limits specified in paragraph 3 of Cessna Citation Alert Service Letter ASL525A-78-01, Revision 1, dated October 27, 2009, replace the thrust attenuator paddle and attachment hardware, as applicable | (i) If the conditions of paragraph 3.A.(1) of Cessna Citation Alert Service Letter ASL525A-78-01, Revision 1, dated October 27, 2009, are met, replace before further flight after the inspection required in paragraph (f)(3) of this AD. After the replacement, continue with the repetitive inspections specified in paragraph (f)(1) of this AD (ii) If the conditions of paragraph 3.A.(2) of Cessna Citation Alert Service Letter ASL525A-78-01, Revision 1, dated October 27, 2009, are met, replace within the next 150 hours TIS after the inspection required in paragraph (f)(3) of this AD. After the replacement, continue with the repetitive inspections specified in paragraph (f)(1) of this AD | Follow Cessna Citation Alert Service Letter ASL525A-78-01, Revision 1, dated October 27, 2009. |
| (5) Replace both thrust attenuator paddles | Within the next 300 hours TIS after July 22, 2010 (the effective date of this AD), or within 1 year after July 22, 2010 (the effective date of this AD), whichever occurs first | Follow Cessna Citation Service Bulletin SB525A-78-02, Revision 1, dated February 5, 2010. |
(g) The replacement required in paragraph (f)(5) of this AD terminates the repetitive inspection requirement of this AD. This replacement may be done at anytime, but must be done no later than 300 hours TIS after July 22, 2010 (the effective date of this AD), or within 1 year after July 22, 2010 (the effective date of this AD), whichever occurs first.
(h) If, before July 22, 2010 (the effective date of this AD), you have done all the actions in the original issue of Cessna Citation Service Bulletin SB525A-78-02, dated November 13, 2009, then no further action is required by this AD. This is considered “unless already done” credit for this AD action.
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
