Robinson R66 - Engine Gages

95-30 Engine Gages
95-31 N
1
Tachometer
A. Description
The electronic N
1
tachometer indicates percent RPM of the engine’s gas producer
section. The N
1
sensor is a sealed variable-reluctance, permanent-magnet device
mounted atop the engine’s accessory gearbox adjacent to the hoisting lug.
B. Schematic
Refer to Figure 98-1 for electrical schematic.
C. Removal
1. Turn battery switch off and pull out applicable circuit breaker(s).
2. Remove screws securing upper console to lower console and tilt upper console
aft.
3. Loosen screws securing console wiring connector to G144-6 instrument cluster
and disconnect wiring.
4. Remove screws securing instrument cluster to G051 shell assembly’s face plate
and remove instrument cluster.
D. Installation
1. Turn battery switch off and pull out applicable circuit breaker(s).
2. Remove screws securing upper console to lower console and tilt upper console
aft.
3. Position G144-6 instrument cluster on G051 shell assembly’s face plate and
install screws. Verify security.
4. Connect console wiring connector to G144-6 instrument cluster tighten connector
screws. Verify security.
5. Tilt console forward and install screws securing upper console to lower console.
Verify security.
6. Perform appropriate function checks per § 5-40.
E. Scheduled Maintenance and Inspections
Refer to § 5-45 100-Hour/Annual Inspection.
Page 95.14 Chapter 95 Instrument System APR 2017