C. Engine Run Adjustments (continued)
2. First Engine Run (continued)
(f) Checkoverspeed governor.
(1.) Set propeller control to full increase rpm.
(2.) Increase power until propeller rpm (Np) is 1600 ± 20 rpm.
(3.) Push and hold hydraulic topping governor (htg) test switch up. Check that Np decrease
50 to 125 rpm. (4.) Release htg test switch. Check that Np increases to original rpm. (5.) Refer to 61-20-00 for corrective action.
(g)
Checkautoignition.
(1.) Select ignition switch to automatic (AUTO). (2.) Advance power levers. Check that ignition is off when torque has increased to 365 + 60 foot-pounds. (3.) Move power levers back. Check that ignition is on at not less than 250 foot-pounds torque. (4.) Refer to 74-10-00 and 74-20-00 for corrective action.
(h)
Check engine alignment. Refer to Chart 2.
CHART 1
ENGINE OPERATING LIMITS (Sheet1 of 2)
OPERATING
CONDITION OPERATING LIMITS
TORQUE (1) MAXIMUM OIL OIL
OBSERVED Ng Np(8) PRESSURE TEMP
POWER SETTING SHP 2000 1900 1700 ITT°C RPM PSIG (2) C
RPM RPM RPM (6) (7)
TAKEOFF 720 1895 800 104 2000 105to 135 0 to 104
MAX.
CONTINUOUS 720 1895 1995 2230 800 104 2000 105 to 135 0 to 104
MAX.CRUISE 720 1895 1995 2230 800 104 2000 105to 135 0 to 104
RECOMMENDED CLIMB CRUISE 720 1895 1995 2230 775 104 2000 105to 135 0 to 99
MIN. IDLE 750 (5) 56 (5) 60 (MIN) -40 to 104
STARTING 1000 (3) 200 -40 (MIN)
TRANSIENT 2750 850 104 2200 0to 110
(3) (4)
MAX REVERSE (8) 200 760 105to 135 0to 104
EFFECTIVITY:
040-999
PAGE
22 76-10-00
Jan 10/90
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
C. Engine Run Adjustments (continued)
2. FirstEngineRun (continued)
CHART 1
ENGINEOPERATINGLIMITS (Sheet2 of 2)
NOTE:Enginecoolinghasbeen demonstrated
withoil cooler doorsopenfor all flight operationsfromsea level to 33,000 feet at an International StandardAtmosphere(ISA)temperatureplus66°F.
NOTE:Enginecoolinghas been demonstrated
withoilcooler doors closed for all flight operationsfromseal level to 33,000 feet at ISA plus 40°F.
(1) Torquelimit applieswithin range of 1600 -2000 proprpm (Np); below 1600 rpm,torqueis limited to 1100 lb. ft.
Torquemeter-Power Calculations
shp= rpm (Np) torque (foot-pounds) x K
Where: Np = propellerrpm
K 0.00019
(2)
Normaloilpressureis 105 -135 psig at gas generatorspeedsabove 72% and oil temperatures between60-70°C.Oilpressuresbelow 105 psig are undesirable and indicate oil filter could be restricted.Oilpressurebetween 60 and 105 psig must only be tolerated to complete flight at power settingsnot exceeding 1100 foot-pounds torque. Oil pressure below60 psig is unsafe and requireseitherengine shut downor a landingbe made as soon as possible,usingminimumpowerto sustain flight. Duringextremelycold starts, oil pressurecanreach200psig.
(3)
Valuesare time-limited to 5 seconds.
(4)
Valuesare time-limited to 20 seconds.
(5)
Adjustpower or condition leverto maintain value.
of 55°C is recommended at takeoff power.
(6)
A minimum oil temperature for fuel heater operation
(7)
Transientoil temperature is limited to 110°Cfor 10 minute ground operations only.
(8)
Propellerreverseand Beta rangeoperationalonly with all landing gearon the ground.
EFFECTIVITY:
040-999
76-10-00Jan10/90
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
C. EngineRunAdjustments (continued)
CHART2
ENGINEALIGNMENT(Sheet1 of 2)
NominalSettings IdleN1 56%to 58% Idle ITT 750°C ReverseMax. 180 hp ± 20 hp
Power Oil Pressure 40 psi min.idle
105to 135 psi power on Oil Temp. 0°C to 104°C FuelPress. 15 to 50 psi Max.N2 2000 rpm
LEFTENGINE FORWARDN1 DEAD BAND
Obs PickupD.B. ResetD.B. In. In.
ResetD.B. In.
FinalPickupPoint In.
1900 RPMCK
Obs Torque(Q) Lb-Ft
ResetQ Lb-Ft
ResetQ Lb-Ft
ResetQ Lb-Ft
Final1900 RPM Q Lb-Ft
Tolerance:± 30 ft-lb of target value
± 30 ft-lb betweenengines.
IDLESET
Obs IdleN1 ResetN1 ResetN1
FinalIdle N1
LOW HIGH
AircraftN Number
Pilot
Observer Date
PressureAltitude Ft
OAT
Compute1900rpm Q (FromChart3) Ft-Lb
RIGHTENGINE
FORWARDN1 DEADBAND
Obs PickupD.B. In.
ResetD.B. In. ResetD.B. In. FinalPickupPoint In. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：夏延飞机维护手册 Cheyenne IIIA PA-42-720 AMM 2(152)
