Airworthiness directives › 2017-09-11
AD 2017-09-11 Airworthiness Directives; Bombardier, Inc. Airplanes
Models named: DHC-8-400, -401, -402. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes, certificated in any category, serial numbers 4001 through 4473 inclusive, equipped with Bombardier ModSum 4-422100 or ModSum 4-458687 (Jetway Compatible Passenger Airstair Door).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 600 flight hours after the effective date of this AD, perform a general visual inspection of the forward and aft handle holder brackets for damage, such as visible cracks and deformation; a detailed visual inspection of the forward and aft pin retainer brackets to make sure that both lanyards are installed and to make sure that the head of each pin is installed correctly; a check of the pin retainer brackets for unobstructed movement; an operational check of the forward passenger door; and all applicable corrective actions; in accordance with PART A1 and PART A2 of the Accomplishment Instructions of Bombardier Service Bulletin 84-52-79, Revision C, dated February 2, 2016, except as required by paragraphs (g)(1), (g)(2), and (g)(3) of this AD. Do all applicable corrective actions before further flight. Repeat the inspections and checks thereafter at intervals not to exceed 600 flight hours until the terminating action required by paragraph (h) of this AD is accomplished. (1) If one or both lanyards are missing, before further flight, install lanyards as specified in, and in accordance with PART A1 of the Accomplishment Instructions of Bombardier Service Bulletin 84-52-79, Revision C, dated February 2, 2016. (2) If a pin is not installed correctly, as specified in PART A1 of the Accomplishment Instructions of Bombardier Service Bulletin 84-52-79, Revision C, dated February 2, 2016, before further flight, adjust the affected pin until it is installed correctly as specified in, and in accordance with, PART A1 of the Accomplishment Instructions Bombardier Service Bulletin 84-52-79, Revision C, dated February 2, 2016. (3) If a pin retainer bracket does not rotate freely, before further flight, adjust affected parts of the assembly until the pin retainer bracket rotates freely as specified in, and in accordance with, PART A1 of the Accomplishment Instructions of Bombardier Service Bulletin 84-52-79, Revision C, dated February 2, 2016.
Unsafe condition
This AD was prompted by reports of interruptions in the airstair door operation, including one case where the door would not open. The airstair door is classified as an emergency exit. We are issuing this AD to ensure the ability to evacuate passengers through the airstair door in the event of an emergency.
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