Piper PA-39 Twin Comanche C/R User Manual

TWIN COMANCHE C/R
7
7 L.
ALTERNATOR PARALLELING SYSTEM (FOR AIRCRAFT SER. NOS. 39-146 AND UP)
On aircraft equipped with the subject system, each alternator is controlled independentI>- b>.
its own voltage regulator. These regulators are interconnected electronically so as to provide
paralleled outputs from their associated alternators under normal operating engine RPM ranges.
An ammeter that can be switched into either alternator output lead is provided for system
monitoring, along with alternator “INOP” warning lights that illuminate when their associated
alternator is not producing a voltage.
In the event of an alternator “INOP” indication the following steps should be taken:
i:
Reduce electrical load to minimum for continued safe flight.
Turn OFF one section of the Master Switch (L or R, as appropriate) to open the
corresponding alternator field circuit. Reset all circuit breakers which may have tripped.
C. Turn ON the section of the Master Switch which had been previously turned OFF and
if “INOP” light goes out - reinstate electrical load.
d.
If, after turning ON the section of the Master Switch, the “INOP” light remains lit
and/or the alternator circuit breaker switch has tripped, turn the same section of the Master
Switch OFF and continue flight with reduced electrical load.
e. In the event that both alternator “INOP” lights come on simultaneously, repeat the
above procedure for each alternator individually.
f. If both alternators fail to return to normal operation, turn ON Master Switch and turn
OFF both alternator circuit breaker switches. Terminate flight as soon as possible.
CAUTION
The alternator circuit breaker switches should not be opened
manually wheneverthe alternators are functioning normally.
..-:
3.
CIRCUIT BREAKERS
AlI circuit breakers are grouped in the lower right comer of instrument panel. To reset the
circuit breakers push in on the reset button.
4.
FUEL MANAGEMENT
a.
Normal Operation
(1) Take-off and landing
(a) Fuel valve “ON” main tanks.
(b) Electric fuel pumps “ON”.
(2) Cruising
(a) Fuel valves “ON” (Main or Auxiliary).
(b) Electric fuel pumps “OFF”.
b. Crossfeed Operation and Single Engine Operation :
A crossfeed is provided to increase the range during single engine emergency
operating conditions. Fuel system operation is as follows:
( 1) Cruising
(a) When using fuel from tanks on the same side as the operating engine, the
following will apply:
(1) Fuel Valve “ON” (main or auxiliary) on Operating engine side.
(2) Fuel Valve “OFF” on Inoperative engine side. ,-
(3) Electric fuel pumps “OFF” (except in case of engine driven pump
failure, electric fuel pump on operating engine side must be used).
REPORT: 1605 PART I PAGE 10
MODEL: PA-39
.
FAA APPROVED November 28,1969
REISSUED: June 1,197O
REVISED: November 30,197 1
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Piper PA-39 Twin Comanche C/R Specifications

General

Brand	Piper
Model	PA-39 Twin Comanche C/R
Category	Aircrafts
Language	English