Airworthiness Directive · Amendment 39-16242 · Oxygen
The Boeing Company Model 757 Airplanes
This AD applies to The Boeing Company Model 757-200, -200CB, -200PF, and -300 series airplanes, certificated in any category; as identified in the service bulletins listed in Table 1 of this AD.
| Boeing Service Bulletin | Revision | Dated | Applicable model/series |
|---|---|---|---|
| 757-35A0015 | 2 | June 15, 2000 | 757-200, 757-200CB, 757-200PF. |
| 757-35A0016 | 1 | June 15, 2000 | 757-300. |
We are adopting a new airworthiness directive (AD) for certain Model 757 airplanes. This AD requires inspecting to verify the part number of the low-pressure flex-hoses of the flightcrew and supernumerary oxygen system installed under the oxygen mask stowage box at a flightcrew and supernumerary oxygen mask location, and replacing with a new non-conductive low-pressure flex-hose of the oxygen system if necessary. This AD results from reports of a low-pressure flex-hose of a flightcrew oxygen system that burned through due to inadvertent electrical current from a short circuit in an adjacent audio select panel. We are issuing this AD to prevent inadvertent electrical current, which can cause the low-pressure flex-hose of a flightcrew or supernumerary oxygen system to melt or burn, resulting in oxygen system leakage and smoke or fire.
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 36 months after the effective date of this AD, inspect to determine whether any low-pressure flex-hose of the flightcrew and supernumerary oxygen systems installed under the oxygen mask stowage location has a part number identified in Table 2 of this AD. A review of airplane maintenance records is acceptable in lieu of this inspection if the part number of the low-pressure flex-hoses of the flightcrew and supernumerary oxygen system can be conclusively determined from that review.
(1) For any low-pressure flex-hose having a part number identified in Table 2 of this AD, before further flight, replace the hose with a new or serviceable part, in accordance with the Accomplishment Instructions of the applicable service bulletin identified in Table 1 of this AD. Recording the part number of the hose being replaced is not required by this AD.
(2) For any low-pressure flex-hose not having a part number identified in Table 2 of this AD, no further action is required by this paragraph.
As of the effective date of this AD, no person may install a flightcrew or supernumerary oxygen hose with a part number identified in Table 2 of this AD on any airplane.
| Equivalent Boeing supplier part numbers— | Sierra Engineering | Spencer Fluid | Puritan Bennett | Hydraflow | AVOX (formerly Sierra Engineering) |
|---|---|---|---|---|---|
| 60B50059-70 | 835-01-70 | 9513-20S5-18.0 | ZH784-20 | 38001-70 | 9513-835-01-70 |
| 60B50059-81 | 835-01-81 | 9513-20S5-24.0 | ZH784-81 | 38001-81 | 9513-835-01-81 |
(i) Actions accomplished before the effective date of this AD in accordance with Boeing Alert Service Bulletin 757-35A0015, dated September 2, 1999, or Revision 1, dated November 11, 1999; or Boeing Alert Service Bulletin 757-35A0016, dated November 11, 1999; are considered acceptable for compliance with the corresponding actions specified in 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
