Systems Description
Section 7
Model G58
7-31
COWL FLAPS
The cowl flap for each engine is controlled by a manual control
lever located on the lower center console. The cowl flap is
closed when the lever is in the up position and open when the
lever is down.
PROPELLERS
McCauley Propellers (Standard):
Installed as standard equipment are two McCauley constant-
speed, variable-pitch propellers, each with three aluminum
alloy blades. Maximum diameter allowed is 77 inches. Mini-
mum diameter allowed is 76.5 inches. The pitch setting at the
30-inch station is 15.2° ± 0.2° low pitch and 82.5° ± 0.5° feath-
ered.
Hartzell Propellers (Optional):
If the airplane is equipped with two Hartzell, constant speed,
variable pitch, three blade, aluminum hub, aluminum blade,
model PHC-J3YF-2UF/FC7391D(K) propellers, the (K) in the
propeller blade designates that the propeller is equipped with
electro-thermal deice. Maximum diameter allowed is 75
inches. Minimum diameter allowed is 73 inches. The pitch set-
ting at the 30-inch station is 12.8° ± 0.2° low pitch, 18.5° ± 1.0°
high pitch and 80.0° ± 0.5° feathered.
All Propellers:
Propeller RPM is controlled by a governor in each engine
which regulates hydraulic oil pressure to the hubs. Push-pull
levers on the center pedestal allow the pilot to select each gov-
ernor’s RPM range.
If engine oil pressure is lost, the propeller will go to the full high
pitch position. This is because propeller low pitch is obtained
by governor boosted engine oil pressure working against the
centrifugal twisting moment of the blades.
May, 2015
58-590000-67A12_sec07.fm Page 31 Wednesday, May 27, 2015 8:58 AM
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