8 • Aircraft Systems
Standby Instruments
Standby Attitude Indicator
An electrical standby attitude indicator is powered and charged by the electrical
system during normal operations. During an electrical failure, the standby
attitude indicator will continue operating from its internal dedicated battery for
approximately 60 seconds while an amber blinking LED prompts you to press
the “STBY PWR” button, which continues operation until the internal battery is
depleted. A fully charged standby attitude indicator battery should provide up
to 1 hour of normal standby attitude indicator operation; however, a situation
requiring use of the standby attitude indicator is an emergency. Exit IMC and
land as soon as possible.
If the pilot fails to activate the standby battery within 60 seconds,
the STBY PWR button can still be pressed to activate the standby
battery; however, the gyro may not be oriented to the airplane
depending on the time elapsed prior to pressing the STBY PWR
button. Press the STBY PWR button while the amber LED is
blinking for best results.
Standby Attitude Indicator Battery Check
Prior to flight, the electric standby indicator battery must be tested. In order
to accomplish the test, aircraft electrical power must be on (Battery Master
ON) and the standby attitude indicator gyro must be fully operational with the
red gyro flag out of view. Test the standby battery as called for by the Run Up
Checklist.
•
Press and hold the “STBY PWR” button for approximately four seconds.
This puts the gyro in a one-minute battery test mode. The amber LED
next to STBY PWR will flash during the test sequence.
•
A continuous green light illuminated beneath “TEST” during the full
sequence indicates that the standby battery is good.
•
A red light illuminated anytime during the test indicates that the
battery is not charged and may require replacement. Contact
maintenance.
Standby Attitude Indicator Shutdown
During a normal shutdown following the Shutdown Terminate Checklist, do
not press the “STBY PWR” button. Doing so activates emergency operation and
depletes the internal standby battery. Turn the battery master switch OFF when
prompted by the checklist. Allow the amber LED to blink for approximately
60 seconds, followed by the appearance of the red gyro warning flag, which
indicates the unit is powered down.
Summary of Contents for Piper Archer
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