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CS 25.1305 Powerplant instruments

Available versions for ERULES-1963177438-10148

ED Decision 2021/015/R found in: CS-25 Amdt 27 - Large Aeroplanes (Jan 2023)

Version Text

CS 25.1305 Powerplant instruments

ED Decision 2021/015/R

(See AMC 25.1305)

The following are required powerplant instruments:

(a) *For all aeroplanes*

(1) A fuel pressure warning means for each engine, or a master warning means for all engines with provision for isolating the individual warning means from the master warning means.

(2) Fuel indication system(s) which:

(i) Provide(s) to the flight crew a full-time display of the total quantity of usable fuel on board;

(ii) Is (are) capable of indicating to the flight crew the quantity of usable fuel in each tank in accordance with [CS 25.1337(b)](#_DxCrossRefBm1709821533);

(iii) Provide(s) fuel quantity and availability information to the flight crew, including alerts, to indicate any fuel system condition (e.g. misconfiguration or failure) that, if not corrected, would result in no fuel being supplied to one or more engine(s). This includes:

(A) Abnormal fuel transfer between tanks;

(B) Trapped fuel;

(iv) Provide(s) a low fuel level cockpit alert for any tank and/or collector cell that should not become depleted of fuel.

Each alert is such that:

(A) It is provided to the flight crew when the usable quantity of fuel in the tank concerned reaches the quantity required to operate the engine(s) for 30 minutes at cruise conditions;

(B) The alert and the fuel quantity indication for that tank are not adversely affected by the same single failure. (See [AMC 25.1305(a)(2)](#_DxCrossRefBm1709821589))

(3) An oil quantity indicator for each oil tank.

(4) An oil pressure indicator for each independent pressure oil system of each engine.

(5) An oil pressure warning means for each engine, or a master warning means for all engines with provision for isolating the individual warning means from the master warning means.

(6) An oil temperature indicator for each engine.

(7) Fire-warning devices that provide visual and audible warning.

(8) An augmentation liquid quantity indicator (appropriate for the manner in which the liquid is to be used in operation) for each tank.

(b) Reserved.

(c) For turbine engine-powered aeroplanes. In addition to the powerplant instruments required by sub-paragraph (a) of this paragraph, the following powerplant instruments are required:

(1) A gas temperature indicator for each engine.

(2) A fuel flow meter indicator for each engine.

(3) A tachometer (to indicate the speed of the rotors with established limiting speeds) for each engine.

(4) A means to indicate, to the flight crew, the operation of each engine starter that can be operated continuously but that is neither designed for continuous operation nor designed to prevent hazard if it failed.

(5) An indicator to indicate the functioning of the powerplant ice protection system for each engine.

(6) An indicator for the fuel strainer or filter required by [CS 25.997](#_DxCrossRefBm1709821484) to indicate the occurrence of contamination of the strainer or filter before it reaches the capacity established in accordance with [CS 25.997(d)](#_DxCrossRefBm1709821484).

(7) A warning means for the oil strainer or filter required by [CS 25.1019](#_DxCrossRefBm1709821491), if it has no bypass, to warn the pilot of the occurrence of contamination of the strainer or filter screen before it reaches the capacity established in accordance with [CS 25.1019(a)(2)](#_DxCrossRefBm1709821491).

(8) An indicator to indicate the proper functioning of any heater used to prevent ice clogging of fuel system components.

(9) A vibration indication system that indicates unbalances in engine rotor systems and, when applicable, in propeller rotating assemblies.

(d) *For turbo-jet engine-powered aeroplanes.* In addition to the powerplant instruments required by sub-paragraphs (a) and (c) of this paragraph, the following powerplant instruments are required:

(1) An indicator to indicate thrust, or a parameter that is directly related to thrust, to the pilot. The indication must be based on the direct measurement of thrust or of the parameters that are directly related to thrust. The indicator must indicate a change in thrust resulting from any engine malfunction, damage or deterioration. (See [AMC 25.1305(d)(1)](#_DxCrossRefBm1709821588).)

(2) A position indicating means to indicate to the flight crew when the thrust reversing device –

(i) Is not in the selected position, and

(ii) Is in the reverse thrust position, for each engine using a thrust-reversing device.

(e) *For turbo-propeller-powered aeroplanes*. In addition to the powerplant instruments required by sub-paragraphs (a) and (c) of this paragraph, the following powerplant instruments are required:

(1) A torque indicator for each engine.

(2) Position indicating means to indicate to the flight crew when the propeller blade angle is below the flight low pitch position, for each propeller.

(3) Reserved

(f) For aeroplanes equipped with fluid systems (other than fuel) for thrust or power augmentation, an approved means must be provided to indicate the proper functioning of that system to the flight crew.

[Amdt No: 25/12]

[Amdt No: 25/18]

[Amdt No: 25/27]