Airworthiness Directive · Amendment 39-18060 · Ice and rain protection
Bombardier, Inc. Airplanes
(1) This AD applies to Bombardier, Inc. Model BD-700-1A10 airplanes, certificated in any category, equipped with any electrical wiring heater current/brake temperature monitor unit (HBMU) installed in accordance with any FAA supplemental type certificate specified in table 1 and table 2 of paragraph 1.A., “Effectivity,” of Bombardier Service Bulletin 700-30-021, Revision 01, dated November 21, 2012.
(2) For airplanes on which the applicable service request for product support action (SRPSA) specified in table 3 and table 4 of paragraph 1.A., “Effectivity,” of Bombardier Service Bulletin 700-30-021, Revision 01, dated November 21, 2012, has been incorporated, the requirements of this AD have been met.
We are superseding Airworthiness Directive (AD) 2014-03-05, for certain Bombardier, Inc. Model BD-700-1A10 airplanes. AD 2014-03-05 required modification of the air data probes and sensors. This new AD continues to require modification of the air data probes and sensors. This new AD also adds airplanes to the applicability. This AD was prompted by a report that the manufacturer has determined that some completion centers used the heater current/brake temperature monitor unit (HBMU) logic circuit to control the line voltage of the drain mast heaters. We are issuing this AD to detect and correct an unannunciated failure of two pitot static probe heaters, which could affect controllability of the airplane in icing conditions.
This paragraph restates the requirements of paragraph (g) of AD 2014-03-05, Amendment 39-17742 (79 FR 10331, February 25, 2014). For airplanes equipped with any electrical wiring HBMU installed in accordance with any FAA supplemental type certificate specified in table 1 of paragraph 1.A., “Effectivity,” of Bombardier Service Bulletin 700-30-021, Revision 01, dated November 21, 2012: Within 800 flight hours or 15 months after April 1, 2014 (the effective date of AD 2014-03-05), whichever occurs first, modify the air data probes and sensors, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 700-30-021, Revision 01, dated November 21, 2012.
For airplanes equipped with any electrical wiring HBMU installed in accordance with any FAA supplemental type certificate specified in table 2 of paragraph 1.A., “Effectivity,” of Bombardier Service Bulletin 700-30-021, Revision 01, dated November 21, 2012: Within 800 flight hours or 15 months after the effective date of this AD, whichever occurs first, modify the air data probes and sensors, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 700-30-021, Revision 01, dated November 21, 2012.
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
