Airworthiness Directive · Amendment 39-19635 · Ice and rain protection
The Boeing Company Airplanes
(1) This AD applies to The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 737-30A1064, Revision 1, dated October 18, 2017.
(2) Installation of Supplemental Type Certificate (STC) ST01219SE does not affect the ability to accomplish the actions required by this AD. Therefore, for airplanes on which STC ST01219SE is installed, a “change in product” alternative method of compliance (AMOC) approval request is not necessary to comply with the requirements of 14 CFR 39.17.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 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. We are issuing this AD to address the unsafe condition on these products.
For airplanes identified as Group 5 in Boeing Alert Service Bulletin 737-30A1064, Revision 1, dated October 18, 2017: Within 120 days after the effective date of this AD, inspect the airplane and do all applicable on-condition actions using a method approved in accordance with the procedures specified in paragraph (m) of this AD.
Except as specified by paragraph (j) of this AD, for airplanes identified as Groups 1 through 4 in Boeing Alert Service Bulletin 737-30A1064, Revision 1, dated October 18, 2017: At the applicable times specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 737-30A1064, Revision 1, dated October 18, 2017, 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 1, dated October 18, 2017.
For airplanes identified as Groups 1 through 4 in Boeing Alert Service Bulletin 737-30A1064, Revision 1, dated October 18, 2017: Prior to or concurrently with the action required by paragraph (h) 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.
For purposes of determining compliance with the requirements of this AD: Where Boeing Alert Service Bulletin 737-30A1064, Revision 1, dated October 18, 2017, uses the phrase “the original issue date of this service bulletin,” this AD requires using “the effective date of this AD.”
