Airworthiness Directive · Amendment 39-17590 · Stall warning system
The Boeing Company Airplanes
This AD applies to The Boeing Company series airplanes, certificated in any category, as specified in paragraphs (c)(1), (c)(2), and (c)(3) of this AD.
(1) Model 727, 727C, -100, -100C, -200, and -200F series airplanes, identified in Boeing Special Attention Service Bulletin 727-34-0245, dated June 4, 2008.
(2) Model 737-100, -200, and -200C series airplanes, identified in Boeing Special Attention Service Bulletin 737-34-2102, dated June 5, 2008.
(3) Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, 747SR, and 747SP series airplanes, identified in Boeing Special Attention Service Bulletin 747-34-2925, dated June 4, 2008.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 727 airplanes; Model 737-100, -200, and -200C series airplanes; and Model 747-100, -100B, -100B SUD, -200B, -200C, - 200F, -300, -400, -400D, -400F, 747SR, and 747SP series airplanes. This AD was prompted by a report of an activation of the control column shaker during takeoff. This AD requires performing a general visual inspection to determine if a certain angle of attack (AOA) sensor with a paddle type vane is installed, and, for affected sensors, performing an operational test of the stall warning system, and replacing the AOA sensor with a new sensor if necessary. We are issuing this AD to prevent erroneous activation of the control column shaker during takeoff, which could result in runway overrun, failure to clear terrain or obstacles after takeoff, or reduced controllability of the airplane.
Within 36 months after the effective date of this AD: Do a general visual inspection of the left and right angle of attack (AOA) sensor as applicable, to determine if a certain AOA sensor with a paddle type vane is installed, in accordance with the Accomplishment Instructions of the applicable service information specified in paragraph (g)(1), (g)(2), or (g)(3) of this AD.
(1) Boeing Special Attention Service Bulletin 727-34-0245, dated June 4, 2008 (for Model 727 airplanes).
(2) Boeing Special Attention Service Bulletin 737-34-2102, dated June 5, 2008 (for Model 737-100, -200, and -200C series airplanes).
(3) Boeing Special Attention Service Bulletin 747-34-2925, dated June 4, 2008 (for Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, 747SR, and 747SP series airplanes).
Operators may accomplish a stall warning system test in lieu of the inspection specified in paragraph (g) of this AD by using a method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA.
If, during the inspection required by paragraph (g) of this AD, it is determined that an AOA sensor with a paddle type vane is installed: Before further flight, do an operational test of the stall warning system, in accordance with Part 2 of the Accomplishment Instructions of the applicable service information specified in paragraph (g)(1), (g)(2), or (g)(3) of this AD.
(1) For group 2 airplanes identified in Boeing Special Attention Service Bulletin 747-34-2925, dated June 4, 2008: If you cannot get the values given in the table specified in Part 2 of the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-34-2925, dated June 4, 2008, before further flight, replace the AOA sensor, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-34-2925, dated June 4, 2008.
(2) For all airplanes, except those identified in paragraph (i)(1) of this AD: If the AOA sensor fails to activate the control column shaker in the operational test, replace the AOA sensor with a new AOA sensor, in accordance with Part 3 of the Accomplishment Instructions of the applicable service information specified in paragraph (i)(2)(i), (i)(2)(ii), or (i)(2)(iii) of this AD.
(i) Boeing Special Attention Service Bulletin 727-34-0245, dated June 4, 2008 (for Model 727 airplanes).
(ii) Boeing Special Attention Service Bulletin 737-34-2102, dated June 5, 2008 (for Model 737-100, -200, and -200C series airplanes).
(iii) Boeing Special Attention Service Bulletin 747-34-2925, dated June 4, 2008 (for Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, 747SR, and 747SP series airplanes).
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.
Aircraft
