190-02081-03
GFC 600H HFCS Part 27 STC Maintenance Manual
Rev. 3
Page 6-5
6.2 GFS 83 Servo
WARNING
Ensure that the aircraft hydraulic power is off before removal or installation of GFS 83
servo. Unplug any auxiliary power supply.
NOTE
See Airbus Aircraft Maintenance Manual task 29-00-00, 2-1 for instructions on
connecting and disconnecting hydraulic ground power.
Two variants of the GFS 83 servo are used in GFC 600H FCS installation in Airbus Helicopters AS 350.
Clutched servo is used to control yaw axis and clutchless servos are used to control pitch and roll axis.
Refer to Figure 6-3 and Figure 6-4 for detailed depiction during the following removal and re-installation
procedures of the GFS 83 servos and related parts.
Table 6-1 BoM for Pitch and Roll Servo Installation
Qty Item
Part Number
Description
6
28
NAS1149F0463P WASHER, FLAT, STEEL, CAD PLATED, Ø0265 ID, Ø0.500 OD, 0.063 IN THICK
2
27
NAS1149F0432P WASHER, FLAT, STEEL, CAD PLATED, Ø0265 ID, Ø0.500 OD, 0.063 IN THICK
16
26
NAS1149F0332P WASHER, FLAT, STEEL, CAD PLATED, Ø0203 ID, Ø.438 OD, 0.032 IN THICK
4
25
MS24665-134
PIN, COTTER (SPLIT), Ø1/16, 0.75 IN LONG
2
24
MS21071-3
NUT, SELF-LOCKING, PLATE, ONE LUG, REDUCED RIVET SPACING, LOW
HEIGHT, STEEL 0.190-32 UNJF-3B
6
23
MS21047-3
NUT, SELF-LOCKING, PLATE, TWO LUG, LOW HEIGHT, STEEL, 450F,
0.190-32 UNJF-3B
2
22
MS20470AD4-3
RIVET, SOLID, UNIVERSAL HEAD, Ø0.125 IN X 0.188 IN LONG
6
21
MS20470AD3-3
RIVET, SOLID, UNIVERSAL HEAD, Ø3/32 IN X 3/16 IN LONG
16
20
MS20426AD3-3
RIVET, SOLID, COUNTERSUNK 100°, PRECISION HEAD, Ø3/32X3/16 IN LONG
2
19
AN4C12
BOLT, MACHINE, AIRCRAFT, .2500-28 UNF-3A, 13/16 IN GRIP, DRILLED
SHANK, CRES
1
18
AN4-7
BOLT, MACHINE, AIRCRAFT, .2500-28 UNF-3A, 7/16 IN GRIP, DRILLED SHANK
8
17
AN3H5A
BOLT, MACHINE, AIRCRAFT, .1900-32 UNF-3A, 1/4 IN GRIP, DRILLED HEAD
3
16
AN320-4
NUT, PLAIN, CASTELLATED, SHEAR, STEEL 1/4-28 UNF-3B
2
15
AN3-5A
BOLT, MACHINE, AIRCRAFT, .1900-32 UNF-3A, 1/4 IN GRIP, UNDRILLED
2
14
AN3-4A
BOLT, MACHINE, AIRCRAFT, .1900-32 UNF-3A, 1/8 IN GRIP, UNDRILLED
4
13
AN3-3A
BOLT, MACHINE, AIRCRAFT, .1900-32 UNF-3A, 1/16 IN GRIP, UNDRILLED
2
12
23111AG060LE
WASHER, FLAT, Ø6.0XØ12.0XØ1.2 MM, AIRBUS HELICOPTERS
1
11
22731BC060041M BOLT, THREADED, WITH PIN HOLE, Ø6MMX41MM LONG, AIRBUS HELIC
1
10
22451BC060L
NUT, HEXAGONAL, SLOTTED, M6X1.0, AIRBUS HELICOPTER
1
9
117-01021-02
SPACER, Ø5/16 ROD END BEARING, 6MM BOLT
1
8
117-01021-01
BUSHING, Ø5/16 ROD END BEARING, 6MM BOLT
1
7
117-01020-02
ASSEMBLY, ROD, ROLL CONTROL, GFC 600H, AIRBUS H125
1
6
117-01020-01
ASSEMBLY, ROD, PITCH CONTROL, GFC 600H, AIRBUS H125
1
5
115-02595-00
BRACKET, PITCH & ROLL SERVO, AIRBUS H125, FAA-PMA
2
4
011-04560-04
KIT, MECHANICAL FUSE, SHEAR DEVICE, GFS 83, 75 IN-LBF
1
3
011-04559-04
ATTACHMENT KIT, 2.00 IN ARM, SHEAR DEVICE, GFS 83
1
2
011-04559-02
ATTACHMENT KIT, 1.50 IN ARM, SHEAR DEVICE, GFS 83
2
1
011-03367-11
GFS 83 SERVO, CLUTCHLESS