JUL 2020 Chapter 20 Standard Practices Page 20.11
20-33 Special Torques (continued)
AREA FASTENER
TORQUE
(IN.-LB)
MAIN ROTOR
GEARBOX
(Cont’d)
(1) A880-1208 or AN814-8D plug, main rotor gearbox filler plug 150
(1) MS21245L8 nut, securing input yoke to main gearbox 40 FT-LB
(1) chip detector wire terminal nut 5
MAIN ROTOR HUB
(1) NAS634-105 bolt, teeter hinge and
(2) NAS634-105 bolt, coning hinges
New bolt: 0.021-
0.022 inch
elongation, wet
Used bolt: 0.020-
0.022 inch
elongation, wet,
and cotter pin
holes must align
MAST TUBE (1) B277-064 clamp, lower rib to mast tube 50
PITCH LINKS
(2) 21FKF-813 or 27FKF-813 self-locking jam nuts, main
rotor pitch links
300
POWERPLANT
(1) D745-3 (pressure) switch assembly 65
(1) F147-1 screw, FCU minimum throttle stop 20
(1) F170 fitting, engine gearbox vent 100
(1) F727-1 line assembly, fuel pump drain 50-65
(1) F727-2 line assembly, horizontal turbine-firewall shield
assembly drain
50-65
(1) F741-1 line assembly, fuel differential pressure switch 80
(1) G200-1 engine lifting lug (optional) 110
(1) G426-1 (fuel differential pressure) switch assembly 100
(2) nuts, securing harness wire to MGT thermocouple studs,
engine-supplied
20
(2) nuts, securing harness wires to starter-generator small
terminals, starter-generator supplied
20
(2) nuts, securing harness wires to starter-generator large
terminals, starter-generator supplied
180
(1) nut, securing harness wire to ignition exciter box, engine-
supplied
15
(2) nuts, securing harness and (2) MS21919WCH4 clamps to
engine accesory gearbox, engine-supplied
40
(4) nuts, securing F577-1 bracket assembly, engine-supplied 40
(2) tee bolts, securing F173-1 struts to engine, engine-supplied 35-40
(2) A880-908 or AN815-8D unions, engine oil outlet & oil tank
vent
250
(1) A880-910 or AN815-10D union, engine oil inlet 375
(1) AN919-0D reducer and (1) AN919-2D reducer 100
(2) NAS6605-3 bolt, securing G200-1 lug to engine (optional) 110
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