System Faults and
Annunciations
The duplication of the stall warning system en-
sures that a single passive fault cannot prevent
a stick shake from occurring. Should an active
fault develop, the faulty system can be isolated
via the appropriate circuit breaker. The re-
maining good system will still operate both
stick shaker motors.
The stall identification system is designed so
that a single active fault cannot give an inad-
vertent stick push. At the same time, the sys-
tem also ensures that a single passive fault
would not prevent a push operation from oc-
curring, when required.
All annunciator warnings in the stall warn-
ing and identification system will also cause
a repeater STALL IDENT annunciator on the
MWS panel to illuminate (Figure 15-24).
The power to energize a stall valve is routed
via the identification relay of one channel and
the warning relay of the other channel.
A monitoring circuit will cause an IDNT 1 or
IDNT 2 annunciator (depending on the chan-
nel at fault) to illuminate after a 4-second
time delay—if an identification signal from
one SSU has been triggered without a warn-
ing signal from the other SSU. The IDNT 1
o r I D N T 2 a n n u n c i a t o r s a r e p a r t o f t h e
IDNT/INHIB switches provided for both pi-
lots (Figure 15-24). When an IDNT annunci-
ator is illuminated, either pilot can push the
associated switch to inhibit the faulty chan-
nel. The INHIB annunciator part of the switch
will then illuminate.
The third channel sensor, together with the re-
maining SSU, would provide a stick push op-
eration when required.
15-26
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
28
26
24
22
20
18
16
14
0
1
2
3
4
5
6
7
9
VANE RATE—DEGREES/SECOND
VANE ANGLE TO HFD —DEGREES
FLAPS 0
°
WARN
FLAPS 15/25
°
WARN
FLAPS 45
°
WARN
FLAPS 0
°
IDENT
FLAPS >0
°
IDENT
NOTE:
HFD IS THE
HORIZONTAL
FUSELAGE DATUM.
Figure 15-23. Variation of Stall Identification Angle With Increased Vane Angle
Summary of Contents for 800 XP
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