Technical data

13773-001
77-10
Page 1
POWER
1. DESCRIPTION
This section describes that portion of the engine indicating system which indicates power. Included are the
Tachometer, Manifold Pressure Gage (MAP), and MAP Sensor.
A 2¼” Tachometer is mounted on the right instrument panel adjacent to the other engine instruments. The
tachometer pointer sweeps a scale marked from 0 to 3500 RPM in 100 RPM increments. The electrically
operated tachometer receives a speed signal from a the RH magneto. 28 VDC for instrument operation
and lighting is supplied through the 5-amp ENGINE INSTRUMENTS circuit breaker on the Essential Bus.
A 2¼” combination MAP/Fuel Flow Gage is mounted on the right instrument panel immediately below the
tachometer. The gage is internally lighted. 28 VDC for instrument operation is supplied through the 5-amp
ENGINE INSTRUMENTS circuit breaker on the Essential Bus.
2. MAINTENANCE PRACTICES
A. Tachometer (See Figure 77-101)
(1) Removal - Tachometer
(a) Ensure BAT 1, BAT 2, and AVIONICS master switches are in off position.
(b) Pull ENGINE INSTRUMENT circuit breaker.
(c) Remove MFD. (Refer to 34-40)
(d) Locate and disconnect tachometer electrical connector.
(e) While supporting tachometer, remove screws securing unit to instrument panel and
remove from airplane.
(2) Installation - Tachometer
(a) Position tachometer in instrument panel and attach with screws.
(b) Attach electrical connector.
(c) Reset ENGINE INSTRUMENT circuit breaker.
(d) Install MFD. (Refer to 34-40)
B. Map/Fuel Flow Gage (See Figure 77-101)
(1) Removal - MAP/Fuel Flow Gage
(a) Ensure BAT 1, BAT 2, and AVIONICS master switches are in off position.
(b) Pull ENGINE INSTRUMENT circuit breaker.
(c) Remove MFD. (Refer to 34-40)
(d) Locate and disconnect MAP/fuel flow gage electrical connector.
(e) While supporting MAP/fuel flow gage, remove screws securing unit to instrument panel.
and remove from airplane.
(2) Installation - MAP/Fuel Flow Gage
(a) Position MAP/fuel flow gage in instrument panel and attach with screws.
(b) Attach electrical connector.
(c) Install MFD. (Refer to 34-40)
(d) Reset ENGINE INSTRUMENT circuit breaker.
30 Nov 2000