Rockwell Commander 112 - Page 67

SECTION ill
HYDRAULICS
MAINTENANCE MANUAL
ROCKWELL
COMMANDER
112/B/TC/TCA
g.
h.
i.
3-10
GEAR DOWN
HYDRAULIC
PRESSURE
SWITCH
HYDRAULIC
POWER PACK
X23 GAG
Figure 3-5. Hydraulic Power Pack
Gear selector switch - DOWN .
Master battery switch - ON.
Check for following:
1 . Pressure on gear down pressure gage
should indicate 500-800 psi on Model 112,
aircraft thru Serial number 35, and 850-1250
psi on Serial numbers 36 thru 380. On all air-
craft Serial numbers 381 thru 430, the gage
reading shall be 450-700 psi, and at Serial
number 431 and subsequent, the gage reading
shall be 450-550 psi.
NOTE
Model 112 (Serial numbers thru 380).
To obtain above psi, one gear-down
limit switch must be misadjusted to
keep hydraulic power pack unit ope-
rating. This can be accomplished
by loosening limit switch attachment
screws or removing limit switch
from gear. Return limit switch to
its original configuration after com-
pletion of psi check. During pre-
ceding checks, there should be no
external leakage.
Place gear selector switch in UP position.
Check for following:
1 . Gear shall retract in 14 seconds maximum
2. Pressure on gear up pressure gage shall
indicate 1600-2000 psi on Model 112, Serial
numbers thru 380. On all aircraft 381 thru
430 the gage reading shall be 1425-1575 psi,
and at Serial numbers 431 and SUbsequent,
gage reading should be 1600 to 1700 pSi.
NOTE
Model 112 (Serial numbers thru 380).
Landing gear must be restrained from
retracting, by holding or blocking the
gear, to obtain the above pressure
reading.
j. Place gear selector switch in DOWN pOSition
while observing pressure on gear up pressure gage.
Gear shall extend in 10 seconds maximum. After
gear is fully extended, pressure on gear up gage shall
drop to zero and remain at zero.
k. Check to ascertain gears are down and locked,
return aircraft to original configuration.
NOTE
Should tests indicate hydraulic power
pack is not operating correctly, replace
unit.
Change 3
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