Airworthiness Directive · Amendment 39-16361 · Hydraulic power
Bombardier, Inc. Model DHC-8-400, -401, and -402 Airplanes
This AD applies to Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes, certificated in any category; serial numbers 4001, 4003, 4004, 4006, and 4008 through 4184 inclusive.
We are superseding an existing 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:
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 14 days after July 10, 2007 (the effective date of AD 2007-12-03, Amendment 39-15081, which was superseded by AD 2008-17-06), revise the Limitations section of the applicable AFM to include the information in the applicable Bombardier temporary amendment specified in Table 1 of this AD, as specified in the temporary amendment. These temporary amendments introduce procedures for pulling the “HYD PWR XFER” circuit breaker in the event of the loss of all hydraulic fluid in the No. 1 or No. 2 hydraulic system. Operate the airplane according to the limitations and procedures in the applicable temporary amendment.
| For model— | Use Bombardier temporary amendment— | Issue— | Dated— | To Bombardier Dash 8 Q400 Airplane Flight Manual— |
|---|---|---|---|---|
| DHC-8-400 airplanes | 13 | 1 | July 14, 2005 | PSM 1-84-1A. |
| DHC-8-401 airplanes | 13 | 1 | July 14, 2005 | PSM 1-84-1A. |
| DHC-8-402 airplanes | 13 | 1 | July 14, 2005 | PSM 1-84-1A. |
Note 1: This may be done by inserting a copy of the applicable temporary amendment into the applicable AFM. When the applicable temporary amendment has been included in general revisions of the AFM, the general revisions may be inserted into the AFM, provided the relevant information in the general revisions is identical to that in the temporary amendment.
Within 14 days after September 2, 2008 (the effective date of AD 2008-17-06), revise the applicable AFM Normal and Abnormal Procedures section to include the information in the applicable Bombardier temporary amendment specified in Table 2 of this AD, as specified in the temporary amendment. These temporary amendments introduce additional procedures for ensuring that the “PTU CNTRL” switch is Normal, the “PTU CNTRL ON” advisory light is out, and the “HYD PWR XFER” circuit breaker is pulled in the event of the illumination of the “#2 HYD ISO VALVE” caution light. After accomplishing the AFM revision, the AFM limitation required by paragraph (g) in this AD may be removed from the AFM.
| For model— | Use Bombardier temporary amendment— | Issue— | Dated— | To Bombardier Dash 8 Q400 Airplane Flight Manual— |
|---|---|---|---|---|
| DHC-8-400 airplanes | 13 | 3 | June 9, 2008 | PSM 1-84-1A. |
| DHC-8-401 airplanes | 13 | 3 | June 9, 2008 | PSM 1-84-1A. |
| DHC-8-402 airplanes | 13 | 3 | June 9, 2008 | PSM 1-84-1A. |
(i) Within 6,000 flight hours after the effective date of this AD, modify the PTU control logic, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 84-29-22, Revision A, dated February 24, 2009. Doing this modification terminates the requirements of paragraphs (g) and (h) of this AD, and after the modification has been done, the AFM limitation required by paragraphs (g) and (h) of this AD may be removed from the AFM.
(j) Modifying the PTU control logic is also acceptable for compliance with the requirements of paragraph (i) of this AD if done before the effective date of this AD, in accordance with Bombardier Service Bulletin 84-29-22, dated December 5, 2008.
Note 2: This AD differs from the MCAI and/or service information as follows: No differences.
