Airworthiness Directive · Amendment 39-14886 · Bombardier Model DHC-8-400 Series Airplanes
Bombardier Model DHC-8-400 Series Airplanes
This AD applies to Bombardier Model DHC-8-400 series airplanes, serial numbers 4001, 4003, 4004, 4006, and 4008 through 4126 inclusive, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for certain Bombardier Model DHC-8-400 series airplanes. This AD requires revising the Airworthiness Limitations Items (ALI) of the maintenance requirements manual to require additional inspection requirements of the maintenance requirements manual for certain principal structural elements (PSEs) related to fuselage cutouts and to reduce an inspection threshold for an existing ALI task on the aft entry door. This AD results from data obtained from the manufacturer's fatigue testing. We are issuing this AD to detect and correct fatigue cracking of certain PSEs, which could result in reduced structural integrity of the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Note 1: This AD requires revisions to certain operator maintenance documents to include new inspections. Compliance with these inspections is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these inspections, the operator may not be able to accomplish the inspections described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance according to paragraph (g) of this AD. The request should include a description of changes to the required inspections that will ensure the continued damage tolerance of the affected structure. The FAA has provided guidance for this determination in Advisory Circular (AC) 25-1529-1.
Within 60 days after the effective date of this AD, revise the Airworthiness Limitations Items (ALI), Part 2, Section 2, of the Bombardier Q400 Dash 8 Maintenance Requirements Manual, PSM 1-84-7, by incorporating the information in Bombardier Q400 Dash 8 Temporary Revisions (TR) ALI-53, dated February 16, 2006; and ALI-54, dated March 27, 2006. Thereafter, except as provided in paragraph (g) of this AD, no alternative structural inspection intervals may be approved for the fuselage and doors as specified in the TRs.
Note 2: The actions required by paragraph (f) of this AD may be done by inserting copies of TR ALI-53, dated February 16, 2006, and TR ALI-54, dated March 27, 2006; into the ALI, Part 2, Section 2, of the Bombardier Q400 Dash 8 Maintenance Requirements Manual, PSM 1-84-7. When TRs ALI-53 and ALI-54 have been included in the general revisions of the maintenance requirements manual, the general revisions may be inserted into the maintenance requirements manual, provided the relevant information in the general revision is identical to that in TRs ALI-53 and ALI-54.
