Commonwealth legislation

AD/BELL 206/146 - Engine RPM Sensor - Limitations

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Commonwealth

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires Bell 206B and 206L helicopters fitted with Allison 250‑C20R engines and Soloy engine‑out sensors P/N 206‑075‑545‑001 (per STCs SH 95‑46/SH 95‑45) to amend the STC Rotorcraft Flight Manual Supplement. The amendment inserts a warning to avoid slow or creeping throttle movements during practice autorotations (to prevent false engine‑out lights/alarms) and a note to set N1 idle to 62–64%. It affects owners/operators, maintenance organisations and flight crews who must update manuals and follow the procedure.

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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/BELL 206/146 Engine RPM Sensor - Limi

AD/BELL 206/146 Engine RPM Sensor - Limitations 7/2001 DM

Applicability: All Model 206B and Series 206L helicopters equipped with Allison 250-C20R engine and Soloy engine power-out warning sensors, part number 206-075-545-001, in accordance with Supplemental Type Certificate (STC) SH 95-46 (FAA STC SH4179NM, applicable to Model 206B) and SH 95-45 (FAA STC SH4169NM, applicable to Model 206L).

Note 1: This Directive is not applicable to helicopters with a part number (P/N) 680- 2551-1 engine out sensor.

Requirement: If not previously accomplished, revise the Limitations Section of the applicable approved STC Rotorcraft Flight Manual Supplement by adding the following Warning Statement and Note:

WARNING: For aircraft with an engine-out sensor other than P/N 680- 2551-1 only. To prevent false engine-out signals, the following procedure must be followed during practice auto-rotations. When entering a practice auto-rotation, avoid a pausing or creeping movement of any throttle decrease or increase between full open and idle. If movement is not made at a firm and continuous rate, N1 RPM undershoot and/or oscillation may occur causing a momentary false engine-out warning light and audio indication.

NOTE: Ensure N1 RPM idle speed is set at 62-64%.

The Amendment may be accomplished by inserting a copy of this Directive into the Flight Manual Supplement.

Note 2: Transport Canada AD CF-2001-13 refers.

Note 3: The above amendment may have been previously accomplished in accordance with either FAA AD 95-24-06 Amdt 39-9438 which required a warning to be inserted in accordance with Soloy Corporation Service Bulletin (SB) 02-680 revised 8 December 1992 or Soloy Corporation SB 02-680R2 dated 25 May 2000 (this SB was approved by the FAA as an Alternate Method of Compliance to AD 95- 24-06 by FAA Transport Airplane Directorate Letter 140S-00-215 dated 16 May 2000).

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/BELL 206/146 Engine RPM Sensor - Limi AD/BELL 206/146 Engine RPM Sensor - Limitations 7/2001 DM

AD/BELL 206/146 Engine RPM Sensor - Limitations 7/2001 DM

Note 1: This Directive is not applicable to helicopters with a part number (P/N) 680- 2551-1 engine out sensor.

Requirement: If not previously accomplished, revise the Limitations Section of the applicable approved STC Rotorcraft Flight Manual Supplement by adding the following Warning Statement and Note:

NOTE: Ensure N1 RPM idle speed is set at 62-64%.

The Amendment may be accomplished by inserting a copy of this Directive into the Flight Manual Supplement.

Note 2: Transport Canada AD CF-2001-13 refers.