Airworthiness Directive · Amendment 39-15544 · Cessna Aircraft Company Model 525 Airplanes
Cessna Aircraft Company Model 525 Airplanes
This AD applies to Model 525 airplanes, serial numbers 525-0600 through 525-0662, that are certificated in any category.
We are adopting a new airworthiness directive (AD) for certain Cessna Aircraft Company (Cessna) Model 525 airplanes. This AD requires you to inspect for missing firewall sealant between the aft firewall assembly and seal assembly; and, if you find that firewall sealant is missing, seal with firewall sealant between the aft firewall assembly and seal assembly. This AD results from a report that firewall sealant may not have been applied between the aft firewall assembly and seal assembly during manufacture of certain Model 525 airplanes. We are issuing this AD to detect and correct missing firewall sealant between the aft firewall assembly and seal assembly, which could result in failure of the fire extinguishing system to prevent the spread of fire through the firewall gap. This failure could lead to an uncontrolled fire.
To address this problem, you must do the following, unless already done:
| Actions | Compliance | Procedures |
|---|---|---|
| (1) Inspect between the 6352225 aft firewall assembly and 6352226 seal assembly for missing firewall sealant | Within the next 60 hours time-in-service (TIS) after July 16, 2008 (the effective date of this AD) or within 60 days after July 16, 2008 (the effective date of this AD), whichever occurs first | Follow Cessna Aircraft Company Citation Service Letter SL525-71-05, Revision 1, dated February 6, 2008. |
| (2) If, as a result of the inspection required by paragraph (e)(1) of this AD, you find there is missing firewall sealant between the 6352225 aft firewall assembly and 6352226 seal assembly, seal with U000117S firewall sealant in the gap between the 6352225 aft firewall assembly and 6352226 seal assembly | Before further flight after the inspection required by paragraph (e)(1) of this AD | Follow Cessna Aircraft Company Citation Service Letter SL525-71-05, Revision 1, dated February 6, 2008. |
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.
