AD/PC-12/58 Air Data Attitude & Heading Reference System (Cth)
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
Pilatus PC-12 Series Aeroplanes
| AD/PC-12/58 | Air Data Attitude & Heading Reference System | 6/2009 TX |
Applicability: | Model PC-12/47E aeroplanes with Manufacturer Serial Number (MSN) 545 and from MSN 1001 and up. |
Requirement: | 1. Unless previously accomplished, amend the PC-12/47E Pilot’s Operating Handbook (POH) Report No 02277 as follows: |
| Insert the following limitation in Section 2 - Limitations: Hold stationary for a minimum of 60 seconds prior to line-up. And Hold stationary when lined up with the runway centreline for a minimum of 15 seconds prior to carrying out a normal take-off. | |
| Insert the following information in Section 3A - Abnormal Procedures: In the event a discrepancy is observed between the PFD and the Electronic Standby Instrument System (ESIS) after take-off, the ESIS must be used as the primary means of attitude reference as long as the problem exists. The Flight Director (FD) and Autopilot (AP) NAV and HDG modes remain unaffected. If the problem does not disappear after 15 minutes, refer to the relevant Emergency Procedure. | |
| Insert the following information in Section 4 - Normal Procedures: Before Departure HOLD minimum 60 seconds prior to line-up Line up check HOLD minimum 15 seconds (aligned with runway centreline) | |
| Amendment of the POH may be accomplished by either inserting POH Temporary Revision (TR) No. 11 or a copy of this Directive into the PC-12/47E POH. |
| The use of later approved revisions of the PC-12/47E POH are acceptable for compliance with the requirements of this Directive. | |
| 2. Remove POH TR No. 9 or the copy of AD/PC-12/55 from the POH. | |
| Note: EASA Emergency AD 2009-0080-E refers. | |
Compliance: | For Requirement 1 - Before further flight after the effective date of this Directive. |
| For Requirement 2 - Concurrent with Requirement 1. | |
| This Airworthiness Directive becomes effective on 7 April 2009. | |
Background: | The European Aviation Safety Agency (EASA) has advised that field reports have indicated that the possibility exists that both Primary Flight Displays (PFDs) could indicate a roll attitude offset of up to 10 degrees in the same direction if an accelerated turn onto the active runway is performed immediately followed by take-off. This condition has been reported to correct itself after several minutes. This situation, if not corrected, could result in an undesired bank angle, which would constitute an unsafe condition. As an interim measure, AD/PC-12/55 (EASA AD 2009-0028-E) required the introduction of a maximum bank angle during climb. As a result of the ongoing investigation, the problem can be temporarily solved with some limitations in the take-off procedure. For these reasons, this Directive supersedes AD/PC-12/55 which will be cancelled and requires revised operational procedures to be inserted into the POH. This action is still considered to be an interim solution and further action is likely to follow. |
David Villiers
Delegate of the Civil Aviation Safety Authority
6 April 2009
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