Piper SEMINOLE PA-44-180, Руководство по обслуживанию

Страница: 631 / 881

F. After completion of the high rpm adjustment, adjust the control system so that the governor con-
trol arm will contact the high rpm stop. The cockpit control lever should be .031 to .062 of an
inch from its full forward stop. ( Refer to Figure 61-4, Sheet 2 of 2) To adjust the control travel,
disconnect the control cable end from the control arm. Loosen the cable jam nut and rotate the
end to obtain the desired level clearance. Connect the cable end and tighten jam nut.
G . It is only necessary to adjust the governor control system high rpm setting. This action
a u t o m a t ic a lly satisfies the positive high pitch setting.
RIGGING AND ADJUSTMENT OF PROPELLER GOVERNOR. (S/n’s 4495001 and up.) (Refer to
Figure 61-4.)
Information Pending.
ENGINE SYNCHROPHASER. (S/n’s 44-7995001 thru 44-8195026 and 44-8107001 thru 44-8207020.)
(Refer to Figures 61-5 and 61-6.)
The synchronizer installation is a Hartzell system which utilizes two pulse generators, a computer, and an
electrically slaved, mechanically operated propeller governor.
With this system, the right engine is utilized as the slave engine and the left engine as the master. The
pulse generators, attached in line with the tachometer cables or rods, on the 44-180 installation are intercon-
nected through the computer which senses the speed of the engines through the magnetic pickups in the pulse
generators. The computer synchronizes the right engine to the left, through a solenoid in the right propeller
governor (slave governor) .
TEST EQUIPMENT.
The Hartzell B-4467-1 Test Set should be used to perform the following tests. The test lights, as they
appear on the set, are defined as follows:
1. POWER light on, indicates power supply to the system computer is of the correct polarity.
— NOTE —
If the engine lights come ON, and STAY ON, when the propellers
are rotated, the pulse generator(s), cables, or tester are defective.
2. RIGHT ENGINE and LEFT ENGINE lights ON, indicate that their respective pulse generator is
wired, and working properly.
3. MANUAL and PHASE lights ON, indicate that, each respective function of the propeller synch switch
is wired correctly.
— NOTE —
The propeller governor with the solenoid is a Hartzell supplied
product. Contact Hartzell for replacement of coil or governor or
Piper for replacement of entire assembly. Hartzell also has the
D-4469 Computer Analyzer unit, which can be purchased from
them, to test the computer.
4. The COIL light ON indicates that the circuit for the propeller governor solenoid coil is correctly wired.
An open circuit, or a grounded wire on Pin 8 is indicated, should the COIL light fail to illuminate.
5. COIL SHORT light ON, indicates an internal dead-short in the right engine propeller governor sole-
noid coil, or a short between the coil leads. The light may also come on if power supply voltage
exceeds 14 volts.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
61-10-00
Page 61-06
Revised: June 20, 1995
3D8