Airworthiness Directive · Amendment 39-14699 · Boeing Model 737-300, -400, -500, -600, -700, -700C, -800, and -900 Series Airplanes
Boeing Model 737-300, -400, -500, -600, -700, -700C, -800, and -900 Series Airplanes
This AD applies to Boeing Model 737-300, -400, and -500 series airplanes identified in Boeing Special Attention Service Bulletin 737-33-1132, Revision 2, dated September 8, 2005; and Model 737-600, -700, -700C, -800, and -900 series airplanes identified in Boeing Service Bulletin 737-33-1133, Revision 3, dated September 8, 2005; certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 737-300, -400, -500, -600, -700, -700C, -800, and -900 series airplanes. This AD requires modifying the wiring for the master dim and test system. For certain airplanes, this AD also requires related concurrent actions as necessary. This AD results from a report that the master dim and test system circuit does not have wiring separation of the test ground signal for redundant equipment in the flight compartment. We are issuing this AD to prevent a single fault failure in flight from simulating a test condition and showing test patterns instead of the selected radio frequencies on the communications panels, which could inhibit communication between the flightcrew and the control tower, affecting the continued safe flight of the airplane.
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 48 months after the effective date of this AD: Modify the wiring for the master dim test system in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 737-33-1132, Revision 2, dated September 8, 2005 (for Model 737-300, -400, and -500 series airplanes); and Boeing Service Bulletin 737-33-1133, Revision 3, dated September 8, 2005 (for Model 737-600, -700, -700C, -800, and -900 series airplanes); as applicable.
Prior to or concurrently with accomplishment of paragraph (f) of this AD, do the actions specified in Table 1 of this AD, as applicable.
| For— | Accomplish all actions associated with— | According to the Accomplishment Instructions of— |
|---|---|---|
| Group 57 airplanes identified in Boeing Special Attention Service Bulletin 737-33-1132, Revision 2, dated September 8, 2005 | Installing an engine instrument system (EIS) and | Boeing Service Bulletin 737-77-1022, Revision 1, dated October 26, 1989. |
| Modifying the advisory system for the EIS | Boeing Service Bulletin 737-77-1023, Revision 1, dated November 9, 1989. | |
| Group 37 and 46 airplanes identified in Boeing Service Bulletin 737-33-1133, Revision 3, dated September 8, 2005 | Installing wiring for the test system for the audio control panel lamp | Boeing Service Bulletin 737-33-1121, Revision 1, dated December 19, 2002. |
| Group 2 airplanes identified in Boeing Service Bulletin 737-33-1121, Revision 1, dated December 19, 2002 | Installing splice SP896 | Boeing Service Bulletin 737-26A1083, Revision 1, dated November 15, 2001. |
| Group 39 airplanes identified in Boeing Service Bulletin 737-33-1133, Revision 3, dated September 8, 2005 | Installing a smoke detection and fire extinguishing system in the cargo compartment | Boeing Service Bulletin 737-26A1083, Revision 1, dated November 15, 2001. |
| Group 59 airplanes identified in Boeing Special Attention Service Bulletin 737-33-1132, Revision 2, dated September 8, 2005 | Replacing the very high frequency (VHF) and high frequency (HF) communications panels with radio control panels | Boeing Service Bulletin 737-23-1102, dated June 3, 1999. |
Actions accomplished before the effective date of this AD in accordance with the service bulletins identified in Table 2 of this AD are considered acceptable for compliance with the corresponding actions specified in this AD.
| Service Bulletin | Revision level | Date |
|---|---|---|
| Boeing Special Attention Service Bulletin 737-33-1133 | Original | December 19, 2002. |
| Boeing Service Bulletin 737-33-1133 | Revision 1 | April 17, 2003. |
| Boeing Service Bulletin 737-33-1133 | Revision 2 | December 4, 2003. |
| Boeing Special Attention Service Bulletin 737-33-1132 | Original | March 20, 2003. |
| Boeing Special Attention Service Bulletin 737-33-1132 | Revision 1 | March 4, 2004. |
