Airworthiness Directive · Amendment 39-16943 · Air conditioning
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 767-200 and -300 series airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 767-21-0246, dated January 7, 2011; and Model 767-300F series airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 767-21-0234, dated August 6, 2009.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 767-200, -300, and -300F series airplanes. This AD was prompted by reports of loss of avionics cooling due to an unserviceable relay installed on a panel as part of the cabin air conditioning and temperature control system (CACTCS). This AD requires doing certain wiring changes, installing a new relay and necessary wiring in the CACTCS, and performing an operational test of the cooling pack system. We are issuing this AD to prevent loss of electrical equipment bay cooling and the overheating of flight deck instruments, which would result in the eventual loss of primary flight displays, an unusually high pilot workload, and depressurization of the cabin.
Within 72 months after the effective date of this AD: Change the wire bundle route and wiring, install a new relay and applicable wiring in the CACTCS, and do an operational test of the cooling pack system, in accordance with the Accomplishment Instructions of the service information specified in paragraph (g)(1) or (g)(2) of this AD, as applicable.
(1) For Model 767-200 and 767-300 series airplanes: Boeing Special Attention Service Bulletin 767-21-0246, dated January 7, 2011.
(2) For Model 767-300F series airplanes: Boeing Special Attention Service Bulletin 767-21-0234, dated August 6, 2009.
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
