Airworthiness Directive · Amendment 39-16596 · Nacelles/pylons
Hawker Beechcraft Corporation (Type Certificate Previously Held by Raytheon Aircraft Company; Beech Aircraft Corporation) Model 400A and 400T Airplanes
This AD applies to Hawker Beechcraft Corporation (Type Certificate previously held by Raytheon Aircraft Company; Beech Aircraft Corporation) airplanes, certificated in any category; as identified in paragraphs (c)(1) and (c)(2) of this AD.
(1) Model 400A airplanes having serial numbers RK-337 through RK-484, RK-486 through RK-570 inclusive, RK-572, RK-573, and RK-575 through RK-577 inclusive.
(2) Model 400T airplane having serial number TX-13.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD requires a detailed inspection for proper sealant of the left and right pylon firewall structures, and corrective actions if necessary. This AD results from reports of missing sealant on the left and right pylon firewall structures. We are issuing this AD to detect and correct missing sealant on the left and right pylon firewall structures, which, in the event of an engine fire, could result in flames penetrating the seams in the firewall between the engine and the aft fuselage, and a subsequent uncontrolled fire in the aft fuselage.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 200 flight hours or 12 months after the effective date of this AD, whichever occurs first: Do a detailed inspection for appropriate coverage of firewall sealant of the left and right pylon firewall structure, as specified in the figures of Hawker Beechcraft Mandatory Service Bulletin SB 54-3946, Revision 2, dated February 2010, and all applicable corrective actions; in accordance with the Accomplishment Instructions of Hawker Beechcraft Mandatory Service Bulletin SB 54-3946, Revision 2, dated February 2010. Do all applicable corrective actions before further flight.
Note 1: For the purposes of this AD, a detailed inspection is: “An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirror, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required.”
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
