AIRCRAFT OPERATING MANUAL
DHC - 7
2
EMERGENCY
ABNORMAL
Revision
Date
: 0
: July 1999
PT. PELITA AIR SERVICE
AOM
P a g e
: 2
: 14 of 15
2.12 THREE ENGINE OPERATION.
Three engine operation of the Dash-7 differs very little from the normal four engine
operation. However some consideration must be given to performance limitations due
to reduced and asymmetric thrust conditions.
2.13 ONE ENGINE INOPERATIVE CLIMB.
Flight crew should review the chart contained within the Dash-7 Flight manual and the
operating data handbook for the performance to be expected under various conditions
and weight. The take-off or landing data cards, normally used in the cockpit
environment, provide a quick reference for the speed to be flown for various
configurations.
If engine failure occurs after V2, Airspeed may be reduced if necessary, but not lower
than V2, until after completing the second segment (minimum 400 ft AGL), or passing
the obstacle clearance height.
While climbing at less than normal climb speed, limit bank angle to 15 deg. to prevent
loss climb performance.
2.14 ONE ENGINE INOPERATIVE APPROACH, LANDING & GO AROUND.
WAT limits for landing are based on overshoot climb performance at approach Flap
position. If the aircraft is not WAT limited, an overshoot climb gradient of 2.7 % is
guaranteed to obstacle clearance height, or a minimum of 400 ft AGL.
At this time, acceleration to VFRI (Flap retraction speed) occurs, after which flap
retraction may be commenced. Landing at specified flap position is predicated on
approaching at the corresponding approach flap position. Since landing flap is not
selected until landing is assured, degradation of overshoot climb performance due to
exceeding WAT limits should not be encountered.
Approach at flap 25 deg. and landing at flap 25 is also acceptable, as long as the
aircraft is not WAT limited for flap 25 overshoot. The flap 45 landing WAT limits
guarantee overshoot climb performance at approach at flap 25, because of the
automatic Flap Dump Valve, which operate when the Power levers are advanced
during the Go Around.
Maximum take-off Torque is defined as 4860 ft / lbs. This figures is reduced with
increases in altitude and temperature, as shown in the Maximum Take-off Power
tables in the flight manual. At this power rating, the engine is also time limited to 5
minutes. Gear and Flap operation is as per normal.
To obtain the required climb gradient, the placarded VGA ( go around speed ) must be
maintained to the end of the second segment.
Consult the performance charts for any possible increases in the landing distance
required, for a flap 25 or flap 45 landing.
Note
Three engine Take-off only for Flight instructors.
Summary of Contents for Dash 7
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