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battery voltage condition is indicated, It w i l l be
necessary to replace at least one EGI battery prior to
removal of DC power from the system or the EGI
almanac data will be lost.
9-48. GPS DIVERGENT.
Appearance of the GPS DIVERGENT message
indicates there exists a significant difference between
the combined INS/GPS navigation solution position and
the stand alone GPS position data.
9-24
If abnormal system operation continues:
1. INS mode of navigation - Select. Compare
reported position to that of a known waypoint
as soon as possible.
If position error is evident:
2. Manual update - Perform to correct the INS
drift.
If position is -not observed:
3. GPS mode of navi-gation -- Select.
If position error is observed:
4. INS mode of navigation - Reselect and
continue flight operations.
9-49. (CDS2/CDS3) LEFT MCPU/RIGHT MCPU
FAILURE.
An MCPU failure will be evidenced when LEFT MCPU
FAIL or RIGHT MCPU FAIL displays on the unaffected
MFD. An automatic reset function provides a built-in
reset in the event of an MCPU failure. If an MCPU
failure occurs without an automatic reset, perform the
following:
1 . MCPU L/R circuit breaker -- Out.
2. MCPU L/R circuit breaker - In. Check MFD
for MCPU caution message.
If MCPU is not recovered:
3. LAND AS SOON AS POSSIBLE. 9-52. AIR DATA SYSTEM FAILURE.
9-50. ( C D S 4 ) L E F T MCPU/RIGHT M C P U
FAILURE.
GROUND
An MCPU failure will be evidenced when LEFT MCPU
FAIL or RIGHT MCPU FAIL displays on the unaffected
MFD. An automatic reset function provides a built-in
reset in the event of an MCPU failure. If an MCPU
failure occurs without an automatic reset, perform the
following:
1 .
2.
MCPU L/R circuit breaker - Out.
MCPU L/R circuit breaker - In. Check MFD
for MCPU caution message.
If MCPU is not recovered:
3. Maintenance action IS required to recover
failed MCPU prior to flight.
TM 1-1520-248-10
IN-FLIGHT
An MCPU failure will be evidenced when LEFT MCPU
FAIL or RIGHT MCPU FAIL displays on the unaffected
MFD. An automatic reset function provides a built-in
reset in the event of a right MCPU failure. The left
MCPU does not have an automatic in-flight reset
function. If the left MCPU fails in flight, perform the
following:
1. LAND AS SOON AS POSSIBLE.
NOTE
In the event of an MCPU failure, the EGI
may reset. After MCPU function is restored,
the EGI will perform an in-flight alignment
unless the aircraft is landed and a manual
alignment is performed.
9-51. MPD WARNING LIGHT ILLUMINATION IN
FLIGHT.
1 . BIT RST switch - RST.
If WRN illuminates again:
2. BIT check - Accomplish.
If an error code displays:
3. LAND AS SOON AS PRACTICABLE.
A failure of the air data system will be evidenced by
failure of airspeed and barometric altitude indications
on the MFDs. As a result, navigation system will be
unreliable. Standby instruments (airspeed and
altimeter) will be unaffected. Therefore:
LAND AS SOON AS PRACTICABLE.
9-53. HYDRAULIC SYSTEM MALFUNCTION.
9 - 5 4 . L O W H Y D P R E S S C A U T I O N
MESSAGE.
It is possible that the LOW HYD PRESS caution
message could be displayed without the presence of
control feedback. In the event this condition occurs,
select an area which will permit a run-on landing with
power and:
9-25
TM 1-1520-248-10
LAND AS SOON AS PRACTICABLE.
9-55. HYDRAULIC POWER FAILURE.
1. Airspeed - Adjust as necessary to attain the
most comfortable level of control movements.
NOTE
Abrupt collective changes, up or down, will
cause increased pilot workload, especially
with roll attitude. Loss of hydraulic power
will result in loss of SCAS, thereby resulting
in a deterioration in flying qualities.
2. HYD SYS circuit breaker - Out; check for
restoration of hydraulic power.
If hydraulic power is not restored:
3. HYD SYS circuit breaker - In.
4. HYD SYS switch - OFF.
WARNING
Do not return the HYD SYS switch to the
HYD SYS position for the remainder of
the flight. This prevents any possibility of
a surge in the hydraulic system creating
sudden, unexpected control movements.
5. Land as soon as practicable at an area which
will permit a run-on landing at an airspeed
slightly above effective translational lift.
9-56. LANDING AND DITCHING.
9-57. LANDING IN TREES.
A landing in trees should be made when no other
landing area is available. In addition to accomplishing
engine failure emergency procedures, select a landing
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OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPTER 2(94)
