Robinsons R66 - Low-Fuel Switch Assembly

Page 28.8 Chapter 28 Fuel System R66 Maintenance Manual 25 OCT 2010
28-21 Fuel Quantity Sender (continued)
C. Calibration
1. Defuel helicopter per Section 12-42.
2. Pull fuel valve knob OFF. Service helicopter with 19.4 gallons of fuel per Section
12-41.
3. Push in GAGES circuit breaker, turn BATTERY switch ON, and read fuel quantity
gage. Verify gage reads one-half needle width to one & one-half needle widths
below one-quarter mark. If fuel gage indication is correct, proceed to step 5.
4. If fuel gage indication is incorrect, remove fuel quantity sender per Part A. Slightly
bend sender lever up for a gage that reads too high, or down for a gage that reads
too low. Install fuel quantity sender per Part B.
5. Turn BATTERY switch OFF; push fuel valve knob ON.
6. Install G271-1 guard and hardware securing guard to F250-1 cover assembly. Verify
security. Close fueling cowl door.
28-22 Low-Fuel Switch Assembly
Refer to R66 Illustrated Parts Catalog (IPC) Figure 28-3.
NOTE
As required, remove fuel quantity sender per Section 28-21 and
F250-1 cover assembly per Section 28-10, to facilitate A521-2
low-fuel switch assembly removal/installation.
CAUTION
Avoid contaminating bladder interior. Cover arms with sleeves
and use lint-free gloves when working inside bladder.
A. Removal
1. Defuel helicopter per Section 12-42.
2. Refer to Section 6-70. Open baggage compartment door. Remove hardware securing
G248-1 (baggage compartment) cover and remove cover.
3. Refer to Figure 28-2. As required, cut and discard safety wire securing A729-55
tube to G930-1 (low-fuel switch) drain assembly. Remove screws securing G930-4
retainer and drain assembly to G250-1 sump tray.
4. Open fueling cowl door and remove fuel cap. Carefully capture A521-2 switch
assembly body with clean mechanical fingers (avoid capturing movable float).
5. Inside baggage compartment, remove nut, washer assembly, and spacer securing
A521-2 switch assembly to tray. Disconnect F049-03 (GCU) electrical harness
wiring from switch assembly wiring at connectors.
6. Carefully pull switch assembly through fuel cap opening (avoid F550-1 [fuel quantity]
sender). Install fuel cap, and close fueling cowl door.