Airworthiness Directive · Amendment 39-17933 · Oxygen
The Boeing Company Airplanes
This AD applies to The Boeing Company airplanes identified in paragraphs (c)(1) through (c)(3) of this AD, certificated in any category.
(1) Model 707-100 long body, -200, -100B long body, and -100B short body airplanes; Model 707-300, -300B, -300C, and -400 series airplanes; and Model 720 and 720B series airplanes; as identified in Boeing 707 Alert Service Bulletin A3538, dated October 2, 2013.
(2) Model 727, 727C, 727-100, 727-100C, 727-200, and 727-200F series airplanes, as identified in Boeing Alert Service Bulletin 727-35A0031, dated July 18, 2013.
(3) Model 737-100, -200, and -200C series airplanes, as identified in Boeing Alert Service Bulletin 737-35A1140, dated August 28, 2013.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 707 airplanes, Model 720 and 720B series airplanes, Model 727 airplanes, and Model 737-100, -200, and -200C series airplanes. This AD was prompted by a report of a fire that originated near the first officer's area and caused extensive damage to the flight deck on a different airplane model. This AD requires replacing the low-pressure oxygen hoses with non-conductive low- pressure oxygen hoses in the flight compartment. We are issuing this AD to prevent electrical current from inadvertently passing through an internal, anti-collapse spring of the low-pressure oxygen hose, which can cause the low-pressure oxygen hose to melt or burn, leading to an oxygen-fed fire and/or smoke in the flight deck.
Within 36 months after the effective date of this AD: Replace the low-pressure oxygen hoses in the flight compartment with non-conductive low-pressure oxygen hoses, in accordance with the Accomplishment Instructions of the service bulletin specified in paragraphs (g)(1) through (g)(3) of this AD, as applicable.
(1) For Model 707-100 long body, -200, -100B long body, and -100B short body series airplanes; Model 707-300, -300B, -300C, and -400 series airplanes; and Model 720 and 720B series airplanes: Boeing 707 Alert Service Bulletin A3538, dated October 2, 2013.
(2) For Model 727, 727C, 727-100, 727-100C, 727-200, and 727-200F series airplanes: Boeing Alert Service Bulletin 727-35A0031, dated July 18, 2013.
(3) For Model 737-100, -200, and -200C series airplanes: Boeing Alert Service Bulletin 737-35A1140, dated August 28, 2013.
