Airworthiness Directive · Amendment 39-21479 · Ice and rain protection
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 737-200 series airplanes, having variable numbers PK625 through PK627 inclusive, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-200 series airplanes. This AD was prompted by reports indicating that the pitot heat switch is not always set to ON, which could result in misleading air data. This AD requires replacement of pitot anti-icing system components, installation of a junction box and wiring provisions, repetitive testing of the anti- icing system, and applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified by paragraph (i) of this AD, for airplanes identified as Group 6 in Boeing Alert Service Bulletin 737-30A1064, Revision 2, dated June 26, 2020: At the applicable times specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 737-30A1064, Revision 2, dated June 26, 2020, do all applicable actions identified as “RC” (required for compliance) in, and in accordance with, the Accomplishment Instructions of Boeing Alert Service Bulletin 737-30A1064, Revision 2, dated June 26, 2020.
Except as specified by paragraph (i) of this AD: Prior to or concurrently with the actions required by paragraph (g) of this AD, install a new J18 junction box to change the anti-icing system, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 737-30-1067, Revision 1, dated May 4, 2017, and install wiring provisions to the anti-icing system, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 737-30-1068, Revision 1, dated May 4, 2017.
(1) Where Boeing Alert Service Bulletin 737-30A1064, Revision 2, dated June 26, 2020, uses the phrase “the Revision 2 date of this service bulletin,” this AD requires using “the effective date of this AD.”
(2) Where Boeing Service Bulletin 737-30-1067, Revision 1, dated May 4, 2017, specifies contacting Boeing for repair instructions: This AD requires doing the repair before further flight using a method approved in accordance with the procedures specified in paragraph (l) of this AD.
