Airworthiness Directive · Amendment 39-16382 · Oxygen
The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP Series Airplanes
This AD applies to The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes, certificated in any category; line numbers 1 through 1229 inclusive.
We are adopting a new airworthiness directive (AD) for certain Model 747 airplanes. This AD requires inspecting to verify the part number of the low-pressure flex-hoses of the crew oxygen system installed under the oxygen mask stowage boxes in the flight deck, and replacing the flex-hose with a new non-conductive low-pressure flex- hose if necessary. This AD results from reports of low-pressure flex- hoses of the crew oxygen system that burned through due to inadvertent electrical current from a short circuit in the audio select panel. We are issuing this AD to prevent inadvertent electrical current, which can cause the low-pressure flex-hoses of the crew oxygen system to melt or burn, causing 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, do an inspection to determine whether any low-pressure flex-hose of the crew oxygen system installed under the oxygen mask stowage box in the flight deck has a part number identified in Table 1 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 crew oxygen system can be conclusively determined from that review.
(1) For any hose having a part number identified in Table 1 of this AD, before further flight, replace the hose with a new or serviceable part, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 747-35A2101, Revision 1, dated May 15, 2003.
(2) For any hose not having a part number identified in Table 1 of this AD, no further action is required by this paragraph.
| Boeing specification part No. | Equivalent hydraflow part No. |
|---|---|
| 60B50059-19 | 38001-19 |
| 60B50059-20 | 38001-20 |
| 60B50059-60 | 38001-60 |
| 60B50059-62 | 38001-62 |
| 60B50059-69 | 38001-69 |
| 60B50059-70 | 38001-70 |
| 60B50059-81 | 38001-81 |
| 60B50059-94 | 38001-94 |
| 60B50059-95 | 38001-95 |
| 60B50059-101 | 38001-101 |
| 60B50059-129 | 38001-129 |
As of the effective date of this AD, no person may install on any airplane a crew oxygen hose with a part number identified in Table 1 of this AD.
