Airworthiness Directive · Amendment 39-13853 · Boeing Model 767-200, -300, and -300F Series Airplanes
Boeing Model 767-200, -300, and -300F Series Airplanes
Model 767-200, -300, and -300F series airplanes; certificated in any category; as listed in Boeing Alert Service Bulletin 767-24A0128, Revision 3, dated June 24, 2004.
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 (c) 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 767-200, -300, and -300F series airplanes, that requires a one-time inspection for discrepancies of all wire bundles, including certain power feeder cables, of the electrical system in the forward cargo compartment ceiling at certain stations; and corrective actions if necessary. This action is necessary to prevent damage to wire bundles, particularly those of the fuel quantity indication system (FQIS), which are located in the subject area. Damage of FQIS wires could cause arcing between those wires and power wires in the damaged wire bundle, and may lead to transmission of electrical energy into the fuel tank, which would result in a potential source of ignition in the fuel tank. This action is intended to address the identified unsafe condition.
To prevent damage of wire bundles in the forward cargo compartment, particularly wires of the fuel quantity indication system (FQIS) installed in that area, which could cause arcing between the FQIS wires and power wires in the damaged wire bundle, lead to transmission of electrical energy into the fuel tank, and result in a potential source of ignition in the fuel tank, accomplish the following:
(a) Within 18 months or 6,000 flight hours after the effective date of this AD, whichever occurs later, do a one-time detailed inspection for discrepancies of all wire bundles, including power feeder cables W208 and W236, of the electrical system in the forward cargo compartment from stations 368 through 742 and from right buttock lines (RBL) 40 through 70, routed along the ceiling, according to the Accomplishment Instructions of Boeing Alert Service Bulletin 767-24A0128, Revision 3, dated June 24, 2004. Discrepancies include chafing or damage of wire bundles near stand-offs that attach the cargo ceiling liner to the floor beams.
Note 2: For the purposes of this AD, a detailed inspection is defined as: “An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.”
(1) Before further flight, repair any discrepancy, according to the Accomplishment Instructions of the service bulletin.
(2) Before further flight, examine the clearance between all wire bundles, including the power feeder cables, in the forward cargo compartment and the cargo liner standoffs, and do the applicable corrective actions specified in paragraphs (a)(2)(i) and (a)(2)(ii) of this AD, according to the service bulletin. A tie cord having P/N BMS 13-54 or equivalent may be used as an alternative to a tie strap having part number BACS38K2.
| If the clearance between the— | Is— | Then— |
|---|---|---|
| (i) Wire bundles and cargo liner standoffs | 0.25 inch or more | No further action is required by this AD. |
| Between 0.13 and 0.25 inch | Install sleeving and lacing tape | |
| Less than 0.13 inch | Install sleeving, lacing tape, cable spacers, and straps. | |
| (ii) Power feeder cables and cargo liner standoffs | 0.13 inch or more | No further action is required by this AD |
| Less than 0.13 inch | Install sleeving, lacing tape, cable spacers, and straps. |
(b) Accomplishment of the inspection and applicable corrective actions before the effective date of this AD in accordance with Boeing Alert Service Bulletin 767-24A0128, dated May 11, 2000; Revision 1, dated December 6, 2001; or Revision 2, dated May 23, 2002; is acceptable for compliance with the corresponding actions required by this AD, provided that those actions were done on all wire bundles, including power feeder cables W208 and W236, of the electrical system in the forward cargo compartment from stations 368 through 742 and from RBLs 40 through 70, routed along the ceiling.
