---
kind: "section"
citation: "14 C.F.R. § 27.1305"
title: "14"
number: "27.1305"
heading: "Powerplant instruments."
url: "https://uscodex.org/cfr/14/27.1305"
---

# §27.1305. Powerplant instruments.


The following are the required powerplant instruments:

- (a) A carburetor air temperature indicator, for each engine having a preheater that can provide a heat rise in excess of 60 °F.
- (b) **A cylinder head temperature indicator, for each—**
  - (1) Air cooled engine;
  - (2) Rotorcraft with cooling shutters; and
  - (3) Rotorcraft for which compliance with [§ 27.1043](/cfr/14/27.1043.md) is shown in any condition other than the most critical flight condition with respect to cooling.
- (c) **A fuel pressure indicator, for each pump-fed engine.**
- (d) **A fuel quantity indicator, for each fuel tank.**
- (e) A means to indicate manifold pressure for each altitude engine.
- (f) An oil temperature warning device to indicate when the temperature exceeds a safe value in each main rotor drive gearbox (including any gearboxes essential to rotor phasing) having an oil system independent of the engine oil system.
- (g) An oil pressure warning device to indicate when the pressure falls below a safe value in each pressure-lubricated main rotor drive gearbox (including any gearboxes essential to rotor phasing) having an oil system independent of the engine oil system.
- (h) **An oil pressure indicator for each engine.**
- (i) **An oil quantity indicator for each oil tank.**
- (j) **An oil temperature indicator for each engine.**
- (k) A means to indicate the r.p.m. of each engine and at least one tachometer, as applicable, for:
  - (1) The r.p.m. of the single main rotor;
  - (2) The common r.p.m. of any main rotors whose speeds cannot vary appreciably with respect to each other; or
  - (3) The r.p.m. of each main rotor whose speed can vary appreciably with respect to that of another main rotor.
- (l) **A low fuel warning device for each fuel tank which feeds an engine.** This device must—
  - (1) Provide a warning to the flightcrew when approximately 10 minutes of usable fuel remains in the tank; and
  - (2) **Be independent of the normal fuel quantity indicating system.**
- (m) Means to indicate to the flightcrew the failure of any fuel pump installed to show compliance with [§ 27.955](/cfr/14/27.955.md).
- (n) A means to indicate the gas temperature for each turbine engine.
- (o) A means to enable the pilot to determine the torque of each turbine engine, if a torque limitation is established for that engine under [§ 27.1521(e)](/cfr/14/27.1521.md?p=e).
- (p) For each turbine engine, an indicator to indicate the functioning of the powerplant ice protection system.
- (q) An indicator for the fuel filter required by [§ 27.997](/cfr/14/27.997.md) to indicate the occurrence of contamination of the filter at the degree established by the applicant in compliance with [§ 27.955](/cfr/14/27.955.md).
- (r) For each turbine engine, a warning means for the oil strainer or filter required by [§ 27.1019](/cfr/14/27.1019.md), if it has no bypass, to warn the pilot of the occurrence of contamination of the strainer or filter before it reaches the capacity established in accordance with [§ 27.1019(a)(2)](/cfr/14/27.1019.md?p=a-2).
- (s) An indicator to indicate the functioning of any selectable or controllable heater used to prevent ice clogging of fuel system components.
- (t) For rotorcraft for which a 30-second/2-minute OEI power rating is requested, a means must be provided to alert the pilot when the engine is at the 30-second and the 2-minute OEI power levels, when the event begins, and when the time interval expires.
- (u) For each turbine engine utilizing 30-second/2-minute OEI power, a device or system must be provided for use by ground personnel which—
  - (1) Automatically records each usage and duration of power at the 30-second and 2-minute OEI levels;
  - (2) Permits retrieval of the recorded data;
  - (3) Can be reset only by ground maintenance personnel; and
  - (4) Has a means to verify proper operation of the system or device.
- (v) Warning or caution devices to signal to the flight crew when ferromagnetic particles are detected by the chip detector required by [§ 27.1337(e)](/cfr/14/27.1337.md?p=e).

## Notes

### Amendments

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27-9, 39 FR 35462, Oct. 1, 1974; Amdt. 27-23, 53 FR 34214, Sept. 2, 1988; Amdt. 27-29, 59 FR 47767, Sept. 16, 1994; Amdt. 27-37, 64 FR 45095, Aug. 18, 1999; 64 FR 47563, Aug. 31, 1999; Amdt. 27-51, 88 FR 8737, Feb. 10, 2023]

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701-44702, 44704.

### Source

Source: Docket No. 5074, 29 FR 15695, Nov. 24, 1964, unless otherwise noted.

### Amendments

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27-9, 39 FR 35462, Oct. 1, 1974; Amdt. 27-23, 53 FR 34214, Sept. 2, 1988; Amdt. 27-29, 59 FR 47767, Sept. 16, 1994; Amdt. 27-37, 64 FR 45095, Aug. 18, 1999; 64 FR 47563, Aug. 31, 1999; Amdt. 27-51, 88 FR 8737, Feb. 10, 2023]