Airworthiness Directive · Amendment 39-18873 · Doors
Bombardier, Inc. Airplanes
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).
We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model DHC-8-400 series airplanes. This AD was prompted by reports of interruptions in the airstair door operation. This AD requires repetitive inspections and modification of the handrail hardware. We are issuing this AD to address the unsafe condition on these products.
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.
Within 6,000 flight hours or 36 months, whichever occurs first, after the effective date of this AD: Incorporate Bombardier ModSum 4-903234 to modify the installed jetway compatible handrail stowage bracket, in accordance with PART A3 of the Accomplishment Instructions of Bombardier Service Bulletin 84-52-79, Revision C, dated February 2, 2016. Incorporating Bombardier ModSum 4-903234 terminates the actions required by paragraph (g) of this AD.
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
