EQUIPMENT ISOLATION
A pitot isolation valve is located in the copi-
lot’s side console under a hinged cover (Figure
16-4). It provides a means of isolating ancil-
lary equipment.
With the valve in the NORMAL position, pitot
pressure is supplied to all relevant instruments
and equipment. Depressing and turning the
valve to isolate the ancillaries maintains P2
supplies to No. 2 air data computer and the
standby airspeed indicator, but isolates the
stall detector and additional equipment.
NOTE
If a discrepancy occurs between left
and right airspeed indications, se-
lect PITOT ISOLATION valve to
ISOLATE.
If the discrepancy is resolved, a fault
exists in the ancillary equipment pip-
ing, which may cause the autopilot to
become disengaged and the IDNT 3
and MWS STALL IDENT annuncia-
tors to illuminate. In this event, press
either IDNT 3 annunciator to inhibit
No. 3 stall identification channel. The
INHIB annunciators illuminate.
If the discrepancy persists without an
AIR DATA FAIL warning, the main
pitot system is at fault. Continue
flight, but exercise extreme caution.
STALL VENTS
A stall vent is located on the underside of each
wing (Figure 16-5). The stall vents are inter-
connected by a pipeline which is connected to
two stall detectors. One stall detector operates
in the third channel of the stall warning and
identification system.
16-4
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
Figure 16-4. Pitot Isolation Valve
Figure 16-5. Wing Stall Vent
Summary of Contents for 800 XP
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