What are the criteria for test completion when using a 30-minute power rating, according to Amendment 27-23?

Test completion criteria include: 5 minutes after the peak temperature is reached, or the continuous time limit of the 30-minute power rating if the highest temperature recorded is not stabilised before.

How does the 30-minute power rating affect cooling capabilities in rotorcraft, according to EASA?

The use of the 30-minute power rating may affect the cooling capabilities of the rotorcraft, and this potential impact should be evaluated during certification.

AMC1 27.1045 Cooling test procedures

Q: What is the purpose of AMC 27.1045 regarding cooling test procedures for small rotorcraft?

AMC 27.1045 supplements FAA AC 27-1B, § AC 27.1045A and should be used in conjunction with that AC when demonstrating compliance with CS 27.1045.

Navigate / EASA

Ask question Discover more Add to collection

ED Decision 2023/001/R

(a) Introduction

This AMC supplements FAA AC 27-1B, § AC 27.1045A and should be used in conjunction with that AC when demonstrating compliance with CS 27.1045.

(b) 30-minute power rating

(1) Explanation

The 30-minute power rating may be set at any level between the maximum continuous up to and including the take-off rating, and may be used for multiple periods of up to 30 minutes each, at any time between the take-off and landing phases in any flight.

This use of this rating may affect the cooling capabilities of the rotorcraft. This potential impact should be evaluated during the certification.

(2) Procedure

In the case of usage of a 30-minute power rating, AC 27.1045A b) should be completed as such:

Procedures. All of the policy material pertaining to this section remains in effect except that the engine fluid temperatures do not have to be stabilised. Paragraph AC 27.1045 currently lists three criteria for test completion: temperature stabilisation, flight test segment completion, or an operation limitation. With Amendment 27-23, a fourth criterion for test completion is:

— 5 minutes after the peak temperature is reached, the test can be considered to be complete, or

— the continuous time limit of the 30-minute power rating if the highest temperature recorded is not stabilised before.

[Amdt 27/10]

Details

Source-Title: AMC1 27.1045 Cooling test procedures View latest amendments

Erulesid: ERULES-1963177438-20238 Compare versions

Domain: Initial airworthiness

Amendedby: Amendment 10

Applicabilitydate: 8 February, 2023

Entryintoforcedate: 8 February, 2023

Regulatorysource: ED Decision 2023/001/R Navigate

Regulatorysubject: CS-27

Typeofcontent: AMC to CS (Acceptable means of compliance to certification specification)

Parentir: CS 27.1045 Cooling test procedures

Origin: EASA

Category: EAR