(c)
Check system power cycle time and sequence with a voltmeter and pins in connector on aircraft harness with system power on.
(d)
Whenelectrical check is completed, reconnect circuit and install engine cowl. °
°
(e) Lipdeicethermoswitchopensat 150 and resetsat 100 +/-10°.
CHART2 INLET DEICERS ELECTRICAL SPECIFICATIONS
TIMER ELEMENT TIME LOAD AMPS RESISTANCE
SEQUENCE HEATED ZONE SEC. @ 28 VDC OHM
Cont. PartingStrip Cont. 28.0 1.0
Zone A
SheddingArea I Shedding Area 34-ON 25.5
Zone B 102-OFF 1.1
SheddingArea II SheddingArea 34-ON 25.5
D. Engine Air Inlet Ice Protection System
1. Removal of Ice Deflector Door Transmission (Figure401)
To remove transmission from aircraft, proceed as follows:
(a)
Remove engine cowling.
(b)
Disconnect electrical leads from transmission assembly.
(c)
Disconnect transmission clevis end from torque tube assembly.
(d)
Disconnect transmission from engine mounting bracket. Remove complete assembly from enginecompartment.
2. Installationof Ice Deflector Door Transmission (Figure 401)
NOTE: To facilitate installation, ensure ice door and transmission are in closed position.
(a)
Position transmission assembly on engine mounting bracket. Secure with proper hardware. Allowtransmission to rotate on mounting bolt.
(b)
Attachtransmission clevis to torque bolt with clevis pin, washers, and cotter pin.
(c)
Connect electrical leads to transmission assembly.
(d)
Check adjustments using paragraph titled Adjustment of Engine Ice Protection System in this chapter.
EFFECTIVITY: PAGE 040-999
Feb 1/98 30-20-00
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
D. Engine Air Inlet Ice Protection System (continued)
VIEWA
Side View of
Ice Deflector Door(OPEN)
12.BypassDoorAssembly
11. Hinge
10. Bolt,Washer,Bushingand Nut
9. RodAssembly
8. Pin
7. Limit Switches & Mounting Bracket
Shims73050-2or 73050-3 may be
addedhere to maintain contour
with cowl.
VIEWB
Side View of Bypass Door (OPEN)
Engine Air Inlet Ice Protection System
Figure 401
EFFECTIVITY: 040-999
30-2000PAGE
30-20-00Jan 10/909
PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
D. EngineAir InletIce Protection System (continued)
1. PartingStrip
7. Urethane
ErosionCoat -
A-A
(Zone B)
' -
3. SheddingArea (Zone C)
I
EngineAir InletLip Assembly
Figure 402
EFFECTIVITY:
040-999
Jan 10/90 30-20-00
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
D. EngineAir Inlet Ice Protection System(continued)
3. Cleaning,InspectionAnd Repair of Ice Deflector Door Transmission (Figure401)
(a)
Removeenginecowling(see71-00-00).
(b)
Clean transmission assemblywith suitablesolvent.
(c)
Inspect transmission screwshaftfor excessive backlashas follows: (1.) Disconnecttransmissionfromicedeflectordoor torque tube lever. (2.) Clamppliers (vise grips)to screwshaft using light pressure on transmission screw. (3.) Movepliers to rotatescrewshaftandensure slight movementis felt (not to exceed 0.312
inch on a 6 inch radiusfromshaft).
(d)
Checktransmissionsleeve,screwshaft,and rod ends for distortion.
(e)
Cleanand dry transmission screwshaftand sleeve. Applycoatingof AircraftActuatorGrease (MIL-G-23827)to transmission shaft.
(f)
Repacktransmission,if disassembled, 75 percentfull with Dukes grease(P/N2196-74-1).
4. Adjustmentof Engine Ice ProtectionSystem (Figure 401)
(a)
Removeice deflector doorinterconnectrod.
(b)
Adjustrearmicroswitchcontactscrewto trigger switch when linkageis locked in DOWN position. Turnscrew out fourfull turns.
(c)
Adjustforwardmicroswitchcontactscrewto trigger switchat ice deflector door UP position(ice deflectordoorparallelandflushwith forwardduct). Turn screwoutone full turn.
(d)
Runextensionmotorto full icedeflectordoorUP position. Adjustbypassdoor to seal.
(e)
Install cowl with ice deflector doorin UP position (parallelandflushwith forward duct). Adjust interconnectrod to allow retainingpinto slip into position.
(f)
Testrun icedeflectordoor,bypassdoorsystem,and recheck up and down positions.
EFFECTIVITY:
040-999 30-20-00PAGE
11
Jan 10/90
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