SECTION 9
PA-28-181, ARCHER III SUPPLEMENT 20
ISSUED: JULY 12, 1995 REPORT: VB-1611
REVISED: FEBRUARY 14, 2006 11 of 30, 9-119
SECTION 3 - EMERGENCY PROCEDURES (continued)
Failure of Attitude, Airspeed and Heading Reference System (ADAHRS)
Indication: Airspeed, Attitude, Heading and Altitude replaced with
Red X’s.
Standby Attitude Gyro ..............................................................VERIFY ON and
flag is pulled on gyro
Maintain attitude control using standby gyro.
If time and conditions permit:
PFD Circuit Breaker................................................................PULL and RESET
If ADAHRS initialization does not occur:
On aircraft equipped with the optional second Nav Indicator (OBS):
Mechanical Nav Indicator (OBS)..........................Utilize for primary navigation
Engine Instruments................................................Refer to Engine page of MFD
NOTE
The Mechanical Nav Indicator (OBS) receives nav
information directly from the No. 2 nav/com/GPS. Only
VLOC information is available.
Maintain attitude, airspeed and heading control using standby instruments,
magnetic compass and other directional indications (such as MFD, MAP/NAV
page).
CAUTION
High current loads in the vicinity of the magnetic compass
can influence its accuracy. Depending on the flight conditions,
the pilot must reduce these loads as much as possible to
insure accuracy. Tests have shown that air conditioner and
pitot heat contribute to significant heading errors of the
magnetic compass. These items should be turned OFF prior
to comparing magnetic compass headings.
Land as soon as practical.
SECTION 9
PA-28-181, ARCHER III SUPPLEMENT 20
ISSUED: JULY 12, 1995 REPORT: VB-1611
REVISED: FEBRUARY 14, 2006 11 of 30, 9-119
SECTION 3 - EMERGENCY PROCEDURES (continued)
Failure of Attitude, Airspeed and Heading Reference System (ADAHRS)
Indication: Airspeed, Attitude, Heading and Altitude replaced with
Red X’s.
Standby Attitude Gyro ..............................................................VERIFY ON and
flag is pulled on gyro
Maintain attitude control using standby gyro.
If time and conditions permit:
PFD Circuit Breaker................................................................PULL and RESET
If ADAHRS initialization does not occur:
On aircraft equipped with the optional second Nav Indicator (OBS):
Mechanical Nav Indicator (OBS)..........................Utilize for primary navigation
Engine Instruments................................................Refer to Engine page of MFD
NOTE
The Mechanical Nav Indicator (OBS) receives nav
information directly from the No. 2 nav/com/GPS. Only
VLOC information is available.
Maintain attitude, airspeed and heading control using standby instruments,
magnetic compass and other directional indications (such as MFD, MAP/NAV
page).
CAUTION
High current loads in the vicinity of the magnetic compass
can influence its accuracy. Depending on the flight conditions,
the pilot must reduce these loads as much as possible to
insure accuracy. Tests have shown that air conditioner and
pitot heat contribute to significant heading errors of the
magnetic compass. These items should be turned OFF prior
to comparing magnetic compass headings.
Land as soon as practical.
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