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ELECTRICAL POWER SUPPLY SYSTEM MALFUNCTIONS
AMMETER SHOWS EXCESSIVE RATE OF CHARGE (Full Scale Deflection)
1. Alternator – OFF
!CAUTION!
WITH THE ALTERNATOR SIDE OF THE MASTER SWITCH OFF, COMPASS DEVIATIONS OF AS MUCH AS 25
DEGREES MAY OCCUR
2. Nonessential Electrical Equipment – OFF
3. Flight – TERMINATE as soon as practical
4. Be aware that the Heading Indicator (HSI) is electric and may fail.
LOW VOLTAGE ANNUNCIATOR (VOLTS) ILLUMINATES DURING FLIGHT (AMMETER
INDICATES DISCHARGE)
NOTE
Illumination of “VOLTS” on the annunciator panel may occur during low RPM conditions with an
electrical load on the system such as during a low RPM taxi. Under these conditions, the annunciator will
go out at higher RPM. The master switch need not be recycled since an overvoltage condition has not
occurred to deactivate the alternator system
5. Avionics Master Switch – OFF
6. Alternator Circuit Breaker (ALT FLD) – CHECK IN
7. Master Switch – OFF (both sides)
8. Master Switch – ON
9. Low Voltage Annunciator (VOLTS) – CHECK OFF
10. Avionics Master Switch – ON
11. If low voltage annunciator (VOLTS) illuminates again:
12. Alternator – OFF
!CAUTION!
WITH THE ALTERNATOR SIDE OF THE MASTER SWITCH OFF, COMPASS DEVIATIONS OF AS MUCH AS 25
DEGREES MAY OCCUR
13. Non-essential Radio and Electrical Equipment – OFF
14. Flight – TERMINATE as soon as practical
15. Be aware that the Heading Indicator (HSI) is electric and may fail.
VACUUM SYSTEM FAILURE
Left Vacuum Annunciator (L VAC) or Right Vacuum Annunciator (VAC R) Illuminates
!CAUTION!
IF VACUUM IS NOT WITHIN NORMAL OPERATING LIMITS, A FAILURE HAS OCCURRED IN THE VACUUM
SYSTEM AND PARTIAL PANEL PROCEDURES MAY BE REQUIRED FOR CONTINUED FLIGHT
1. Vacuum Gauge – CHECK to ensure vacuum within normal operating limits.
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