Airworthiness Directive · Amendment 39-11848 · Boeing Model 737, 757, 767, and 777 Series Airplanes
Boeing Model 737, 757, 767, and 777 Series Airplanes
Model 737 series airplanes, line numbers 1 through 2984 inclusive; Model 757 series airplanes, line numbers 1 through 798 inclusive; Model 767 series airplanes, line numbers 1 through 682 inclusive; and Model 777 series airplanes, line numbers 1 through 083 inclusive; certificated in any category; and equipped with Puritan-Bennett passenger and flight attendant oxygen masks, as listed in Boeing Service Bulletin 737-35-1049, dated September 17, 1998; 757-35-0014, dated September 10, 1998; 767-35-0033, dated September 10, 1998; or 777-35-0005, dated September 3, 1998; as applicable.
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 (d) 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 Boeing Model 737, 757, 767, and 777 series airplanes; that requires a one-time general visual inspection to determine the vendor and manufacturing date of all oxygen masks in the passenger cabin; and corrective action, if necessary. This amendment is prompted by a report that passengers were unable to activate supplemental oxygen generators during an in-flight decompression due to stress corrosion cracking of the crimped copper alloy ferrules used to secure loops on the lanyard ends. The actions specified by this AD are intended to prevent failure of the supplemental oxygen system to deliver oxygen to the passengers and flight attendants in the event of decompression, which could result in injury to passengers and flight attendants.
To prevent failure of the supplemental oxygen system to deliver oxygen to the passengers and flight attendants in the event of decompression, which could result in injury to passengers and flight attendants, accomplish the following:
(a) Within 5 years after the effective date of this AD, perform a general visual inspection to determine the vendor of all oxygen masks in the passenger cabin in accordance with Boeing Service Bulletin 737-35-1049, including Appendix A, dated September 17, 1998 (for Model 737 series airplanes); Boeing Service Bulletin 757-35-0014, including Appendix A, dated September 10, 1998 (for Model 757 series airplanes); Boeing Service Bulletin 767-35-0033, including Appendix A, dated September 10, 1998 (for Model 767 series airplanes); or Boeing Service Bulletin 777-35-0005, including Appendix A, dated September 3, 1998, (for Model 777 series airplanes); as applicable.
Note 2: For the purposes of this AD, a general visual inspection is defined as: “A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or drop-light, and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.”
(1) If the oxygen mask is not manufactured by Puritan-Bennett, no further action is required by this AD for that mask.
(2) If the oxygen mask is manufactured by Puritan-Bennett, OR if the manufacturer of the mask cannot be identified, prior to further flight, perform a general visual inspection to determine the manufacturing date of the oxygen mask, in accordance with the applicable service bulletin.
(b) For each oxygen mask manufactured by Puritan-Bennett or an unidentified manufacturer, if the mask was manufactured between May 1986 and July 1998 inclusive, OR if the manufacturing date cannot be determined: Prior to further flight, accomplish either paragraph (b)(1) or (b)(2) of this AD.
(1) Replace the lanyards on the masks with new lanyards in accordance with Boeing Service Bulletin 737-35-1049, including Appendix A, dated September 17, 1998 (for Model 737 series airplanes); 757-35-0014, including Appendix A, dated September 10, 1998 (for Model 757 series airplanes); 767-35-0033, including Appendix A, dated September 10, 1998 (for Model 767 series airplanes); or 777-35-0005, including Appendix A, dated September 3, 1998 (for Model 777 series airplanes); as applicable.
(2) Replace the existing oxygen mask with a new mask that was manufactured by Puritan-Bennett before May 1986 or after July 1998, or by another vendor, and that has the same Boeing part number, or that is FAA-approved for installation as an alternative to the Puritan-Bennett mask.
(c) As of the effective date of this AD, no person shall install an oxygen mask manufactured by Puritan-Bennett between May 1986 and July 1998 inclusive, on any airplane, unless the lanyard has been replaced with a new lanyard in accordance with paragraph (b) of this AD.
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
