DC Electrical troubleshooting handout book
Electrical Troubleshooting Workbook2
Ring lug bad crimp
https://youtube.com/shorts/cXWvA59PAoM?si=dFQqnw2T9P-mWbuK
Autopilot
AP106
In a WestWind, 4 seconds after “ALT”…”CAP” the pitch mode is in CAPTURE mode. High gain response from the BARO knob to the Control column.
APPS 80
On the ground
APPS 80 “force” indicators actually indicate. Last integrator output before the servo.
Jumper 7 and 10 to look at the APP valids.
does the batt handle snatch and then release
permanent offset may be NAC or LAC
Flight Director.
Fly the aircraft on 1 inverter in NORMAL, 1 in ALTERNATE, the see if it is a inverter sync problem.
HF Com
HF950 System
in a F900, Transmitter/Receiver and the PA must be MOD LEVEL so and so because of the distance from the tail to the nose. the squawk is a tuning tone that will not go away.
Receive problems:
Tune 5000, 10,000, 15,000, or 20,000 for WWV audio.
Remove all connectors to the P.A. Install a temporary antenna to the REC/EXT. try WWV again.
Transmit problems:
AM radio will demodulate the transmitter if it is placed on top of the fuselage.
Watch for 10 to 40 amps on the aircraft load meter while transmitting.
Pin Diode and Headphone works good also.
load resistor
VHF com
Whaite Noise? Temporary antenna
ELT reradiate
Collins 3 digit boxes – 3 429 in, 2 429 out.
422, 422 strap
Audio Integration
VHF Nav
antenna quality/ Audio Quality
ADF
MoneyMaker: ANT(enna) mode rather than ADF mode?
White Noise? If there is no White Noise, temporary sense antenna.
Audio?
Needles stow at 90/270? Needled Hunt? Indicator installed upright?
Loop Modulation stronger when TEST needles are swung away from null
Ground power unit affects needles.
Tends to oppoint correctly ForAft? one bad coil
Needle points OK erratically. H-C excitation on the needle circuit.
DME
Neon lamp at antenna.
GPS
Remove the GPS antenna. Looking down the coax to the receiver, there should be 5VDC on the center pin. That proves the GPS is plugged in and powered.
Radar
FSTBY escape for a 880 stsem is “STBY” button 4 times in 3 seconds
Paint ground targets
TXP:
The cheaper the transponder the more critical the antenna.
Mode C Gillam errors
reply light on all the time
Radio Altimeter:
sloped sheet metal