Airworthiness Directive · Amendment 39-15571 · Fuel
Bombardier Model DHC-8-400 Series Airplanes
This AD applies to all Bombardier Model DHC-8-400, DHC-8-401, and DHC-8-402 airplanes, certificated in any category, all serial numbers.
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 operational safety of the airplane.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Unless already done, do the following actions.
(1) Within 60 days after the effective date of this AD, or before December 16, 2008, whichever occurs first, revise the ALS of the Instructions for Continued Airworthiness to incorporate the inspection requirements of Dash 8 Q400 (Bombardier) Temporary Revision (TR) ALI-69, dated February 9, 2007, to Section 4, “Fuel System Limitations,” of Part 2, “Airworthiness Limitation Items,” of the Bombardier Dash 8 Q400 Maintenance Requirements Manual, Product Support Manual (PSM) 1-84-7 (“the TR to the MRM”). For all fuel system limitations tasks contained in the TR to the MRM, the initial compliance times start at the later of the “Threshold” and “Grace Period” times specified in Table 1 of this AD, and the repetitive inspections must be accomplished thereafter at the interval specified in the TR to the MRM, except as provided by paragraphs (f)(2) and (g)(1) of this AD.
| Compliance time (whichever occurs later) | Threshold | Grace period |
|---|---|---|
| Tasks with 18,000 flight hours/108-month inspection intervals | Before the accumulation of 18,000 total flight hours, or within 108 months since new, whichever occurs first | Within 6,000 flight hours or 36 months after the effective date of this AD, whichever occurs first. |
Note 2: The actions required by paragraph (f)(1) of this AD may be done by inserting a copy of Dash 8 Q400 (Bombardier) TR ALI-69 into the Airworthiness Limitations Section of the Bombardier Dash 8 Q400 MRM PSM1-84-7. When this TR has been included in general revisions of the MRM, the general revisions may be inserted in the MRM, provided the relevant information in the general revision is identical to that in Dash 8 Q400 (Bombardier) TR ALI-69. (2) After accomplishing the actions specified in paragraph (f)(1) of this AD, no alternative inspections or inspection intervals may be used unless the inspections or inspection intervals are part of a later revision of Bombardier Dash 8 Q400 MRM, PSM 1-84-7, Revision 4, dated October 30, 2003, that is approved by the Manager, New York Aircraft Certification Office (ACO), FAA, or Transport Canada Civil Aviation (TCCA) (or its delegated agent); or unless the inspections or inspection intervals are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (g)(1) of this AD.
Note 3: This AD differs from the MCAI and/or service information as follows: No differences.
