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SECTION 9
SUPPLEMENT 3
Both alternator ammeters should be monitored whenever the deice
equipment is in use. An excessive indication shows an excessive electrical
load, which may cause a battery discharging condition that could eventually
lead to battery depletion. Nonessential electrical equipment should be turned
off to correct or prevent this condition.
Anytime total tie bus voltage is below 25 Vdc, the
LOW BUS VOLTAGE annunciator will illuminate.
When ice has accumulated on the unprotected surfaces of the airplane,
aerodynamic buffet commences 5 to 19 knots before the stall. A substantial
margin of airspeed should be maintained above the normal stall speed, since
the stall speed will increase in prolonged icing encounters. For the same
reason, stall warning devices are not accurate and should not be relied upon.
If ice is remaining on the unprotected surfaces of the airplane at the
termination of the flight, the landing can be made using full flaps and carrying
a slight amount of power whenever practical. If ice removal from the
protected surfaces cannot be accomplished (ie. due to a failure of the surface
deice system) prior to the approach, the flaps must be left in the full up
position. Approach speeds should be increased by 10 to 15 knots. Allow for
increased landing distance due to the higher approach speeds.
If cruise airspeed drops below 130 knots in icing
conditions, increase power to maintain 130 knots.
If maximum continuous power is required to
maintain 130 knots, immediate action should be
taken to exit icing conditions.
An icing encounter can render the aircraft radar
unreliable due to beam reflection off of the ice layer
on the radome. Also, there may be a degradation of
communication and navigation equipment due to ice
accumulation on antennas.
REPORT: VB-1710
9-22, 8 of 16
NOTE
CAUTION
NOTE
ISSUED: FEBRUARY 23, 1999
PA-46-350P, MALIBU
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