Airworthiness directives › 2020-12-14
AD 2020-12-14 Airworthiness Directives; Bombardier, Inc., Airplanes
Models named: BD-700-1A10, BD-700-1A11. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes, certificated in any category, serial numbers 9002 through 9828 inclusive, 9830, 9832 through 9835 inclusive, 9840, 9854, 9855, and 9998.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 36 months after the effective date of this AD: Perform an inspection to determine the serial number of the RAT deployment actuator, having part number (P/N) BZ02001-01 (GL456-1301-1). A review of the airplane maintenance records is acceptable in lieu of this inspection, provided the serial number of the RAT deployment actuator can be conclusively determined from that review. (1) If the serial number of the RAT deployment actuator is not listed in the table referred to in paragraph 2.B., Part A-Special Check, of the Accomplishment Instructions of the applicable Bombardier service information specified in figure 1 to paragraphs (g)(1) and (2), (h), and (i) of this AD, no further action is required by this AD. ER03AU20.000 (2) If the serial number of the RAT deployment actuator is listed in the table referred to in paragraph 2.B., Part A-Special Check, of the Accomplishment Instructions of the applicable Bombardier service information specified in figure 1 to paragraphs (g)(1) and (2), (h), and (i) of this AD, do the replacement required by paragraph (h) of this AD.
Unsafe condition
This AD was prompted by a report that the anti-fretting coating on the piston rods of certain ram air turbine (RAT) deployment actuators may have been incorrectly applied. Incorrect application of this anti-fretting coating may lead to galling of the piston rod over time, which could cause the unit to seize and fail to fully deploy. The FAA is issuing this AD to address this condition which, if not corrected, could result in the inability to power essential systems in the event that other sources of power are also lost.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1