190-02081-03
GFC 600H HFCS Part 27 STC Maintenance Manual
Rev. 3
Page 6-34
Refer to Figure 6-17 and Figure 6-18 for sensor installation and adjustment details.
Removal
1. Remove power from the GFC 600H FCS by pulling the FCS circuit breaker.
2. Gain access to the collective position sensor.
3. Disconnect the sensor connector.
4. Loosen the two MS35206-229 screws fastening the sensor spacer to the existing stiffener AY480
LH and remove the spacer with attached sensor.
5. Remove the cotter pin and clevis pin to separate sensor cable from the arm clamped on the existing
collective control torque shaft.
6. If replacing collective position sensor, loosen the two MS16995-3 screws fastening the sensor to
the spacer and remove the sensor.
7. If replacing sensor mount arm and clamp, loosen the two AN3 bolts holding the arm and clamp on
the existing collective control torque shaft and remove.
Re-installation
NOTE
When installing replacement sensor, the collective pitch control must be in the down
position to allow for adjustment of cable length in retracted position. The sensor cable
must be extended by a minimum of 0.2 inches from sensor body in this position.
1. Inspect the sensor and sensor connector. Verify the tension by pulling on the cable. Replace the
senor and/or connector if damaged.
2. Fasten the sensor to spacer, if required, and attach the spacer to existing stiffener AY480 LH.
3. If the sensor mount arm and clamp were removed, lower the collective pitch control down and
install the arm and clamp on the collective torque shaft. Lock with a single safety wire through
both bolt heads in accordance with MS33540, General Practice for Safety Wiring and Cotter
Pinning.
4. If installing a new sensor, loop the cable around the bushing in the arm, adjust the length and crimp
using the sleeve included with the senor; otherwise connect cable terminal to the arm with clevis
pin and secure with MS24665-132 cotter pin.
5. Connect sensor connector to the aircraft harness.
6. Recalibrate the sensor following the procedure detailed in Section 7.3.