Airworthiness Directive · Amendment 39-15480 · Boeing Model 767 Airplanes
Boeing Model 767 Airplanes
This AD applies to Boeing Model 767-200, -300, -300F, and -400ER series airplanes, certificated in any category; as identified in Boeing Special Attention Service Bulletin 767-30-0047, dated January 25, 2007; and Boeing Special Attention Service Bulletin 767-30-0048, dated January 25, 2007.
We are adopting a new airworthiness directive (AD) for all Boeing Model 767 airplanes. This AD requires a one-time inspection to determine the material of the forward and aft gray water drain masts. For airplanes having composite gray water drain masts, this AD also requires installation of a ground bracket and a bonding jumper between a ground bracket and the clamp on the tube of the forward and aft gray water composite drain masts. This AD results from a report of charred insulation blankets and burned wires around the forward gray water composite drain mast found during an inspection of the forward cargo compartment. We are issuing this AD to prevent a fire near a composite drain mast and possible disruption of the electrical power system caused by a lightning strike on a composite drain mast, which could result in the loss of several functions essential for safe flight.
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 60 months after the effective date of this AD, inspect the forward and aft gray water drain masts to determine whether the drain mast is made of aluminum or composite. A review of airplane maintenance records is acceptable in lieu of this inspection if the material of the forward and aft gray water drain masts can be conclusively determined from that review.
(1) For any aluminum gray water drain mast identified during the inspection or records check required by paragraph (f) of this AD, no further action is required by this AD for that drain mast only.
(2) For any composite gray water drain mast identified during the inspection or records check required by paragraph (f) of this AD, do the actions specified in paragraph (g) of this AD.
For any composite gray water drain mast identified during the inspection or records check required by paragraph (f) of this AD: Within 60 months after the effective date of this AD, install a bonding jumper between the new ground bracket and the clamp on the tube of the gray water composite drain mast, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 767-30-0047, dated January 25, 2007 (for Model 767-200, -300, and -300F series airplanes); and Boeing Special Attention Service Bulletin 767-30-0048, dated January 25, 2007 (for Model 767-400ER series airplanes).
As of the effective date of this AD, no person may install, on any airplane, a composite gray water drain mast, unless a new ground bracket and bonding jumper are also installed, as specified in paragraph (g) of this AD.
