Commonwealth legislation

AD/DHC-8/66 - In-Flight Selection of Ground Beta

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

Requires specified DHC‑8 Series 100/200/300 aeroplanes to receive hardware/software mod installations (radio altimeter mod, flight‑idle warning horn, weight‑on‑wheels disarm logic and related ModSums) and a temporary MEL amendment. It targets operators of the listed serial numbers (with stated exclusions) and aims to prevent in‑flight selection of ground Beta — a condition Transport Canada linked to engine failure and propeller overspeed — by warning pilots and blocking unsafe selections; operators must comply by 31 Oct 2001 and obtain local CASA MEL approval (Requirements 1–5; Compliance; Note 2; Background).

JSON API Aviation / CASA instruments

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/DHC-8/66 - In-Flight Selection of Ground Beta.

AD/DHC-8/66 - In-Flight Selection of Ground Beta

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

AD/DHC-8/66 In-Flight Selection of Ground Beta 11/99

Applicability: DHC-8 Series 100, 200 and 300 aeroplanes, except those that have incorporated CAA(UK) flight idle configuration per Bombardier (de Havilland) Customer Requests CR873SOO8112, CR873CH00003 and CH873CH00005.

Requirement: 1. For aeroplanes with serial numbers (S/Ns) 003 to 509, install Bombardier Modification 8/3083 (Modification of Honeywell AA-300 Radio Altimeter) in accordance with Bombardier Regional Aircraft Division Service Bulletin (SB) 8- 34-126 dated 1 May 1998.

2. For aeroplanes with S/Ns 003 to 509 (excluding S/N 130), install Bombardier Modification 8/2852 (Addition of Warning Horn to Flight Idle Gate) in accordance with Bombardier Regional Aircraft Division SB 8-76-15 dated 22 January 1999.

3. For Series 100 aeroplanes S/Ns 003 to 390 with ground spoilers, install Bombardier ModSum 8Q100795 (Installation of weight on Wheels Disarming Logic in Aircraft with Ground Spoilers) in accordance with Bombardier Regional Aircraft Division SB 8-76-18 dated 7 January 1999.

4. For Series 100 and 200 aeroplanes with S/Ns 391 to 524 (excluding S/N 511) without ground spoilers (Post Mod 8/1860) and Series 300 aeroplanes with S/Ns 100 to 523 (excluding S/N 521), install Bombardier ModSum 8Q100794 in accordance with Bombardier Regional Aircraft Division SB 8-76-17 dated 25 January 1999 or Revision A dated 14 May 1999.

5. Amend the DHC-8 Minimum Equipment List (MEL) in accordance with Temporary Revisions No 40 and 41 of the Transport Canada Master Minimum Equipment List (MMEL) to provide three flight days of operation without the system, as long as the trigger system is still functional.

Note 1: Transport Canada AD CF-99-18 refers.

Note 2: Amendments to the MEL must be approved by the local CASA District Office.

Note 3: Temporary Revisions No 40 and 41 were subsequently incorporated into the Transport Canada MMEL as Revision No 17 (pages 34-1 and 61-1 refer).

Compliance 1. Before 31 October 2001.

2. Before 31 October 2001.

3. Before 31 October 2001.

4. Before 31 October 2001.

5. Before 31 October 2001.

This Airworthiness Directive becomes effective on 4 November 1999.

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Background: Transport Canada Civil Aviation has advise that there have been incidents of in-flight selection of ground Beta on DHC-8 aeroplanes, one of which led to an engine failure. In addition, the in-flight selection of ground Beta may lead to propeller overspeed.

This Directive requires modification of the aeroplane to incorporate a Beta warning horn. The warning horn operates when a flight idle gate trigger is raised while either power lever is at any position on the quadrant and the aeroplane is above 20 feet.

Source text

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

1 AD/DHC-8/66 - In-Flight Selection of Ground Beta

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

AD/DHC-8/66 In-Flight Selection of Ground Beta 11/99

2. For aeroplanes with S/Ns 003 to 509 (excluding S/N 130), install Bombardier Modification 8/2852 (Addition of Warning Horn to Flight Idle Gate) in accordance with Bombardier Regional Aircraft Division SB 8-76-15 dated 22 January 1999.

3. For Series 100 aeroplanes S/Ns 003 to 390 with ground spoilers, install Bombardier ModSum 8Q100795 (Installation of weight on Wheels Disarming Logic in Aircraft with Ground Spoilers) in accordance with Bombardier Regional Aircraft Division SB 8-76-18 dated 7 January 1999.

4. For Series 100 and 200 aeroplanes with S/Ns 391 to 524 (excluding S/N 511) without ground spoilers (Post Mod 8/1860) and Series 300 aeroplanes with S/Ns 100 to 523 (excluding S/N 521), install Bombardier ModSum 8Q100794 in accordance with Bombardier Regional Aircraft Division SB 8-76-17 dated 25 January 1999 or Revision A dated 14 May 1999.

5. Amend the DHC-8 Minimum Equipment List (MEL) in accordance with Temporary Revisions No 40 and 41 of the Transport Canada Master Minimum Equipment List (MMEL) to provide three flight days of operation without the system, as long as the trigger system is still functional.

Note 1: Transport Canada AD CF-99-18 refers.

Note 2: Amendments to the MEL must be approved by the local CASA District Office.

Note 3: Temporary Revisions No 40 and 41 were subsequently incorporated into the Transport Canada MMEL as Revision No 17 (pages 34-1 and 61-1 refer).

Compliance 1. Before 31 October 2001.

2. Before 31 October 2001.

3. Before 31 October 2001.

4. Before 31 October 2001.

5. Before 31 October 2001.

This Airworthiness Directive becomes effective on 4 November 1999.

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY