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PITCH TRIM” message below the FMA.
Fly-by-Wire Status Awareness via the PFD
Therefore, by simply looking at this main instrument (PFD), the flight crew is immediately aware of
the status of flight controls, and the operational consequences.
INDICATIONS
Criteria: 330-200
Applicable to: , , , , , , , , , , , , , ,
, , , , ,
The ECAM and PFD indicate any control law degradation.
ON THE ECAM
�� In Alternate Law:
FLT CTL ALTN LAW (PROT LOST)
MAX SPEED 330/0.82
�� In Direct Law:
FLT CTL DIRECT LAW (PROT LOST)
MAX SPEED 330/0.80
MAN PITCH TRIM USE
ON THE PFD
The PFD enhances the PF's awarness of the status of flight controls.
Specific symbols (= in green), and specific formatting of low speed information on the speed scale
in normal law, indicate which protections are available.
When protections are lost, amber crosses (X) appear, instead of the green protection symbols (=).
When automatic pitch trim is no longer available, the PFD indicates this with an amber “USE MAN
PITCH TRIM” message below the FMA.
A330/A340 FLIGHT CREW TRAINING MANUAL
OPERATIONAL PHILOSOPHY
FLIGHT CONTROLS
A330/A340 FLEET OP-020 P 8/16
FCTM 17 JUN 09
Fly-by-Wire Status Awareness via the PFD
Therefore, by simply looking at this main instrument (PFD), the flight crew is immediately aware of
the status of flight controls, and the operational consequences.
PROTECTIONS
Applicable to: ALL
OBJECTIVES
One of the PF's primary tasks is to maintain the aircraft within the limits of the normal flight
envelope. However, some circumstances, due to extreme situations or aircraft mishandling, may
provoke the violation of these limits.
Despite system protections, the PF must not deliberately exceed the normal flight envelope. In
addition, these protections are not designed to be structural limit protections (e.g. opposite rudder
pedal inputs). Rather, they are designed to assist the PF in emergency and stressful situations,
where only instinctive and rapid reactions will be effective.
Protections are intended to:
• Provide full authority to the PF to consistently achieve the best possible aircraft performance in
extreme conditions
• Reduce the risks of overcontrolling, or overstressing the aircraft
• Provide PF with an instinctive and immediate procedure to ensure that the PF achieves the best
possible result.
BANK ANGLE PROTECTION
Bank angle protection prevents that any major upset, or PF mishandling, causes the aircraft to
be in a high-bank situation (wherein aircraft recovery is complex, due to the difficulty to properly
assess such a situation and readily react). Bank angle protection provides the PF with full authority
to efficiently achieve any required roll maneuver.
The maximum achievable bank angle is plus or minus:
• 67 °, within the Normal Flight envelope (2.5 g level flight)
• 45 °, in high AOA protection or high speed protection.
A330/A340 FLIGHT CREW TRAINING MANUAL
OPERATIONAL PHILOSOPHY
FLIGHT CONTROLS
A330/A340 FLEET OP-020 P 9/16
FCTM 17 JUN 09
HIGH SPEED PROTECTION
When flying beyond maximum design speeds VD/MD (which are greater that VMO/MMO), there is
an increased potential for aircraft control difficulties and structural concerns, due to high air loads.
Therefore, the margin between VMO/MMO and VD/MD must be such that any possible overshoot
of the normal flight envelope should not cause any major difficulty.
High speed protection adds a positive nose-up G demand to a sidestick order, in order to protect
the aircraft, in the event of a dive or vertical upset. As a result, this enables a reduction in the
margin between VMO/MMO and VD/MD.
Therefore, in a dive situation:
• If there is no sidestick input on the sidestick, the aircraft will slightly overshoot VMO/MMO and
fly back towards the envelope.
• If the sidestick is maintained full forward, the aircraft will significantly overshoot VMO/MMO
without reaching VD/MD. At approximately VMO +16 / MMO +0.04, the pitch nose-down
authority smoothly reduces to zero (which does not mean that the aircraft stabilizes at that
speed).
airbus HIGH SPEED PROTECTION
A330/A340 FLIGHT CREW TRAINING MANUAL
OPERATIONAL PHILOSOPHY
FLIGHT CONTROLS
A330/A340 FLEET OP-020 P 10/16
FCTM 17 JUN 09
The PF, therefore, has full authority to perform a high speed/steep dive escape maneuver, when
required, via a reflex action on the sidestick. In addition, the bank angle limit is reduced from 67 to
45 °, which minimizes the risk of a spiral dive.
Note: 1. An OVERSPEED warning is provided.
　
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