Piper Comanche PA-24 User Manual

PIPER COMANCHE SERVICE MANUAL
c. Short circuits in the ..... _ ue loeated by ua. of a Ifowle •• Wllea the ..... _ ia revolved
iD the _Ier, with a It .. 1 strip ."ch u • hack .a. blacle held above it, tile blacla will vibrate
above the .a. of the """ature core iD which the ahort is loeatac!. Copper or brush dut iD the
Ilots betweell the COlDlI1Itator bus so_tilDes cauan aborts betwen Mrs wlUch c ... be aliaiDated
by cl .... iIll out the Ilota. Shorts at c:roaa-o ..... of the coila et the core ead c ... oftea be allmi·
nated by budiD, wirws lli",Uy and rewlll.tiIl, the e~ bus wire.
d. Grollftds in the umature Ir. detected by u •• of a teat I .... p IIIId test paiDts. If the I_p
liahts when one test PO;Dt is placed on tIIa co .... utator ,.;tII the otlls. poiDt on the core or shaft,
tile """ature is lfOunded. Grounds oeCIU as a ... ult of insulation failure, which ia ott... .......... t
on by overioediDl ... d conaeqaeat overlleatill, of the ,"erator. Repei .. CSD som.times be .. acle
if _d. are at core eads ( .. here coils cOllle out of slota) by placiDl iDSUl.tiIl' strio. betw...,
core ODd coil which hu ,,,,unded.
9-19. Polariainl Gen_r. After a pDarator hu been repaired ODd reiDatallaci or .t any time
aftar a pllerator hu beeR te.tacl, it lIIut be repolarized to .b s"re tIIat it hu the correct
polarity with ... peet to the battary it is to ch ... e. Failure to c' ,Iarize the .... erator lIIay relult
iD bamed relay contact poillts, a nm-doWD battery IIIId pouibly aeriou dllllla,. to the .... e .. tor
itself. The procedure to foilow in correcting "lIerator polar If depetlds upoll the lenerator.re", •
. Iator .. inn, circuits; that is, whelher the ,"erator field is interllally lf01lDded or is ,fOllDded
through
the re",lator.
9-20. Generator 5erYice Te.t Specification •. Delco-ReillY specifications for 12 volt "lIerators
inatalled a. stllllciard equiplllent on the PA·24-180 ODd PA·24-250 aircraft are u follow.:
Generator
1101900 1101915
Delco-ReillY,
Ref. Service Bulletin
IG-150
IG-150
Brush SpriDI Tension 24 oz.
24 oz.
Field Current (80· F)
Amps 1.62
• 1.72
1.62· 1.72
Volts
12
12
Cold Output
Amps
35
SO
VOIIS
14.0
14
Approx. R.P .M.
3100 3960
Cold Ou,,"ut: Cold output data applies to paerators at 80 de.,.e. F, and .. ith brushes well
seated. Variations in temperature and brush seetin a as well as the coadition of the cenerator may
cause deviations of 100 R.P.:'d. or more from rated. speed.
Hat Output: Hot output is maximum output as controlled by current regulator.
ELECTRICAL SYSTEM
ISSUED: 8118n2
3 A20

Piper Comanche PA-24 Specifications

General

Manufacturer	Piper Aircraft
Model	Comanche PA-24
Type	Light aircraft
First Flight	May 24, 1956
Number Built	4, 857
Seating Capacity	4
Engine	Lycoming O-360
Wingspan	36 ft (11 m)
Length	24 ft 8 in (7.5 m)
Stall Speed	62 mph (100 km/h, 54 kn)
Height	7 ft 6 in (2.3 m)