Airworthiness Directive · Amendment 39-15954 · Boeing Model 737-100, -200, -200C, -300, -400, and -500 Series Airplanes
Boeing Model 737-100, -200, -200C, -300, -400, and -500 Series Airplanes
This AD applies to Boeing Model 737-100, -200, -200C, -300, -400, and -500 series airplanes, certificated in any category; as identified in Boeing Service Bulletin 737-28-1241, Revision 1, dated August 31, 2007.
We are adopting a new airworthiness directive (AD) for certain Boeing Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. For certain airplanes, this AD requires deactivating or modifying the wiring to the outboard landing lights, until the wire bundles and electrical connectors have been replaced. For all airplanes, this AD also requires inspecting for any broken, damaged, or missing fairleads, grommets, and wires in the four electrical junction boxes of the main wheel well, and corrective actions if necessary. For certain airplanes, this AD also requires replacing certain wire bundles for the landing lights and fuel shutoff valves, and related investigative, other specified, and corrective actions if necessary. For certain airplanes, this AD also requires replacing of certain electrical connectors and backshell clamps. This AD results from reports of uncommanded engine shutdowns and burned and damaged wire bundles associated with the outboard landing lights and engine fuel shutoff valves. This AD also results from reports of damaged and missing grommets and broken and damaged fairleads in the electrical junction boxes of the main wheel well. We are issuing this AD to prevent a hot short between the outboard landing light and fuel shutoff valve circuits, which could result in an uncommanded engine shutdown. We are also issuing this AD to prevent corrosion of the electrical connectors of the wing rear spars, which could result in short circuits and consequent incorrect functioning of airplane systems needed for safe flight and landing.
Comply with this AD within the compliance times specified, unless already done.
For Model 737-300, -400, and -500 series airplanes identified in Boeing Alert Service Bulletin 737-33A1140, dated May 22, 2006: Within 180 days after the effective date of this AD, accomplish the actions specified in either paragraph (f)(1) or (f)(2) of this AD. Accomplishing the applicable actions required by paragraph (g) of this AD terminates the requirements of this paragraph.
(1) Deactivate the outboard landing lights by accomplishing all of the actions specified in Part 1 of the Accomplishment Instructions of Boeing Alert Service Bulletin 737-33A1140, dated May 22, 2006.
Note 1: The Master Minimum Equipment List (MMEL) prohibits dispatching an airplane for night operations with deactivated outboard landing lights in the event that either of the inboard landing lights fail. Operators should note that, if the outboard landing lights are deactivated in accordance with Part 1 of Boeing Alert Service Bulletin 737-33A1140, dated May 22, 2006, there is no MMEL relief allowing for this configuration for night operations should any inboard landing light fail.
(2) Modify the wiring to the outboard landing lights by accomplishing all of the actions specified in Part 2 of the Accomplishment Instructions of Boeing Alert Service Bulletin 737-33A1140, dated May 22, 2006.
For all airplanes: Within 60 months after the effective date of this AD, do the applicable actions specified in paragraphs (g)(1), (g)(2), and (g)(3) of this AD, by accomplishing all of the applicable actions specified in the Accomplishment Instructions of Boeing Service Bulletin 737-28-1241, Revision 1, dated August 31, 2007. For Model 737-300, -400, and -500 series airplanes identified in Boeing Alert Service Bulletin 737-33A1140, dated May 22, 2006, accomplishing the applicable actions required by this paragraph terminates the requirements of paragraph (f) of this AD.
(1) Replace the wire bundles for the landing lights and fuel shutoff valves with new, redesigned wire bundles, and do the related investigative, other specified, and corrective actions, as applicable. The related investigative, other specified, and corrective actions must be done before further flight after the replacement.
(2) Do a detailed inspection for any broken, damaged, or missing fairleads, any damaged or missing grommets, and any chafed or damaged wires or wire bundles in the four electrical junction boxes of the main wheel well, and do the applicable corrective actions. The corrective actions must be done before further flight after the inspection.
(3) Replace the electrical connectors and backshell clamps with new, improved electrical connectors and backshell clamps, as applicable.
For airplanes identified as Groups 1 and 2 in Boeing Service Bulletin 737-28-1241, Revision 1, dated August 31, 2007: Actions done before the effective date of this AD in accordance with Boeing Service Bulletin 737-28-1241, dated April 7, 2006, are acceptable for compliance with the requirements of paragraph (g) of this AD.
(i) For all airplanes: Actions done before the effective date of this AD in accordance with Part 2 of the Accomplishment Instructions of Boeing Service Bulletin 737-28-1241, dated April 7, 2006, are acceptable for compliance with the requirements of paragraph (g)(2) of this AD.
