Airworthiness Directive · Amendment 39-17326 · Instruments
the Boeing Company
This AD applies to The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 737-31A1332, Revision 3, dated March 28, 2012.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This AD requires, for certain airplanes, installing two warning level indicator lights on each of the P1-3 and P3-1 instrument panels in the flight compartment. This AD also requires, for certain airplanes, replacing the existing P5-16 and P5-10 panels; and, for certain airplanes, replacing the basic P5-16 panel with a high altitude landing P5-16 panel. Additionally, this AD requires revising the airplane flight manual to remove certain requirements of previous AD actions, and to advise the flightcrew of certain changes. This AD was prompted by a design change in the cabin altitude warning system that would address the identified unsafe condition. We are issuing this AD to prevent failure of the flightcrew to recognize and react to a valid cabin altitude warning horn, which could result in incapacitation of the flightcrew due to hypoxia (a lack of oxygen in the body), and consequent loss of control of the airplane.
Within 36 months after the effective date of this AD: Install two warning level indicator lights on each of the P1-3 and P3-1 instrument panels in the flight compartment, and, as applicable, replace the existing P5-16 and P5-10 panels, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 737-31A1332, Revision 3, dated March 28, 2012.
Note 1 to paragraph (g) of this AD: Note rows (a) and (b) of Figures 1 and 2 of Boeing Alert Service Bulletin 737-31A1332, Revision 3, dated March 28, 2012, provide additional guidance for reworking the P1-3 and P3-1 panels to new part numbers. Section 1.A., “Planning Information—Effectivity,” of the documents specified in those note rows identify part numbers to which those documents apply.
For Group 21, Configuration 2 airplanes, as identified in Boeing Alert Service Bulletin 737-31A1332, Revision 3, dated March 28, 2012: Prior to or concurrently with doing the actions required by paragraph (g) of this AD, replace the basic P5-16 panel with a high altitude landing P5-16 panel, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 737-21-1171, dated February 12, 2009.
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.
Appliances and equipment
