Commonwealth legislation

AD/PA-31/128 - Operation of Deicing Boots

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This AD requires PA‑31 series aircraft with pneumatic deicing boots to have the AFM Limitations revised so boots are activated at the first sign of ice or on ice‑detector annunciation, and are cycled (automatic or manual) to minimise ice until the aeroplane is visually or sensor‑confirmed clear. AFM exceptions (e.g. take‑off, final approach, landing) remain.

Certificate‑of‑Registration holders must amend the AFM and sign the logbook; flight crews must follow the AFM procedure (Requirement). This assigns who records compliance and prescribes in‑flight boot operation.

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Current sections

Direct links to the current provisions in AD/PA-31/128 - Operation of Deicing Boots.

AIRWORTHINESS DIRECTIVE

View image in the official source

View image in the official source
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 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.

AD/PA-31/128 Operation of Deicing Boots

AD/PA-31/128 Operation of Deicing Boots 7/2000

Applicability: Models PA31, PA-31-300, PA-31-325, PA-31-350, PA-31P, PA-31T, PA-31T1, PA-

31T2, PA-31T3 and PA-31P-350 aircraft that are equipped with pneumatic deicing boots.

Requirement: Revise the Limitations Section of the aircraft's Aircraft Flight Manual (AFM) by incorporating the following:

" Except for certain phases of flight where the AFM specifies that deicing boots should not be used (e.g., take-off, final approach, and landing), compliance with the following is required.

Wing and Tail Leading Edge Pneumatic Deicing Boot System, if installed, must be activated:

\- At the first sign of ice formation anywhere on the aircraft, or upon annunciation from an ice detector system, whichever occurs first; and

\- The system must either be continued to be operated in the automatic cycling mode, if available; or the system must be manually cycled as needed to minimize the ice accretions on the airframe.

The wing and tail leading edge pneumatic deicing boot system may be deactivated only after:

\- leaving known or observed/detected icing that the flight crew has visually observed on the aircraft or was identified by the on-board sensors; and

\- after the airplane is determined to be clear of ice."

Alternatively, a copy of this Directive may be inserted in the Limitations Section of the Aircraft Flight Manual preceding the paragraph covering Operation in Icing Conditions.

This AFM amendment may be accomplished by the aircraft CoR holder, who can sign the aircraft logbook for completion of this Directive.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

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 39.1 (1) of CAR 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.

AD/PA-31/128 Operation of Deicing Boots AD/PA-31/128 Operation of Deicing Boots 7/2000

AD/PA-31/128 Operation of Deicing Boots 7/2000

Applicability: Models PA31, PA-31-300, PA-31-325, PA-31-350, PA-31P, PA-31T, PA-31T1, PA-

31T2, PA-31T3 and PA-31P-350 aircraft that are equipped with pneumatic deicing boots.

Requirement: Revise the Limitations Section of the aircraft's Aircraft Flight Manual (AFM) by incorporating the following:

" Except for certain phases of flight where the AFM specifies that deicing boots should not be used (e.g., take-off, final approach, and landing), compliance with the following is required.

Wing and Tail Leading Edge Pneumatic Deicing Boot System, if installed, must be activated:

\- At the first sign of ice formation anywhere on the aircraft, or upon annunciation from an ice detector system, whichever occurs first; and

\- The system must either be continued to be operated in the automatic cycling mode, if available; or the system must be manually cycled as needed to minimize the ice accretions on the airframe.

The wing and tail leading edge pneumatic deicing boot system may be deactivated only after:

\- leaving known or observed/detected icing that the flight crew has visually observed on the aircraft or was identified by the on-board sensors; and

\- after the airplane is determined to be clear of ice."

Alternatively, a copy of this Directive may be inserted in the Limitations Section of the Aircraft Flight Manual preceding the paragraph covering Operation in Icing Conditions.

This AFM amendment may be accomplished by the aircraft CoR holder, who can sign the aircraft logbook for completion of this Directive.