BEECHCRAFT King Air C90
Equipped With:
•
Swept Blade Turbofan Propellers
•
Dual Aft Body Strakes
•
Increased Gross Weight
•
PT6A-28 Engines
Revision IR: August 15, 2017
2-1
Document No. 16-206CGW-28
Section II - Limitations
SECTION II — LIMITATIONS
POWERPLANT
Engine Model ....................................................................................... Pratt & Whitney of Canada PT6A-28
ENGINE OPERATING LIMITS
See the West Tennessee Aviation (STC SA1206SO) airplane flight manual supplement for applicable
engine limitations.
PROPELLER BLADE AND HUB NUMBERS
Two full-feathering, constant-speed, reversing, four-bladed propellers consisting of D9510SK blades and
HC-D4N-3C hubs.
PROPELLER DIAMETER
Maximum diameter:
96.0 inches
Minimum diameter:
95.0 inches
PROPELLER BLADE ANGLES AT 30-INCH STATION
Reverse:
-10.0° ± 0.5°
Feathered:
+86.7° ± 0.5°
PROPELLER REVERSE SPEED LIMITS
Do not select REVERSE until airspeed is below 95 KIAS.
WARNING
PROPELLERS WILL NOT REVERSE AT AIRSPEEDS ABOVE 100
KIAS. BETWEEN 95 KIAS AND 100 KIAS, SIGNIFICANT THRUST
ASYMMETRY MAY OCCUR IF REVERSE IS SELECTED.
PROPELLER ROTATIONAL SPEED LIMITS
CAUTION
Stabilized ground operation between 400 and 1,100 RPM is prohibited.
Operation between 0 and 400 RPM is permissible only with propeller
feathered.
WARNING
STABILIZED GROUND OPERATION WITHIN THE PROPELLER
RESTRICTED RPM RANGE CAN GENERATE HIGH PROPELLER
STRESSES AND RESULT IN PROPELLER FAILURE AND LOSS OF
CONTROL OF THE AIRCRAFT.
The maximum propeller overspeed limit is 2,420 RPM. Propeller speeds above 1,900 RPM indicate
failure of the primary governor. Propeller speeds above 2,000 RPM indicate failure of both primary and
overspeed governors.
