Airworthiness Directive · Amendment 39-11721 · Raytheon (Beech) Model 400A and 400T Series Airplanes
Raytheon (Beech) Model 400A and 400T Series Airplanes
Model 400A series airplanes, having serial numbers RK-01 through RK-188 inclusive; Model 400T (T-1A) series airplanes, having serial numbers TT-01 through TT-180 inclusive; and Model 400T (TX) series airplanes, having serial numbers TX-01 through TX-09 inclusive; certificated in any category.
Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD), applicable to certain Raytheon (Beech) Model 400A and 400T series airplanes, that requires replacement of temperature switch assemblies of the wing ice protection system with new, improved parts. This amendment is prompted by reports of electrical continuity problems with solder joints on the temperature switches of the wing ice protection system. The actions specified by this AD are intended to prevent detachment or breakage of wires in the temperature switch assemblies of the wing ice protection system. Such detachment or breakage of wires could result in the flightcrew not being advised of an over-temperature situation on the leading edge of the wing, which could result in structural damage to the wing.
To prevent detachment or breakage of wires in the temperature switch assemblies of the wing ice protection system, which could result in the flightcrew not being advised of an over-temperature situation on the leading edge of the wing, and consequent structural damage to the wing, accomplish the following:
(a) At the next scheduled inspection, but no later than 200 flight hours after the effective date of this AD, replace temperature switch assemblies of the wing ice protection system with new, improved temperature switch assemblies, in accordance with Raytheon Service Bulletin 30-3008, Revision 1, dated August 1999.
Note 2: Replacements accomplished prior to the effective date of this AD in accordance with Raytheon Service Bulletin 30-3008, dated March 1999, are considered acceptable for compliance with the applicable action specified in this AD.
(b) As of the effective date of this AD, no person shall install, on any airplane, a temperature switch assembly having a part number listed in the “Old Part Number” column of the table in 2.D. of Raytheon Service Bulletin 30-3008, Revision 1, dated August 1999.
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
