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03 - EQUIPMENT
DOC references :
· FCOM 1.22.30 (Flight Guidance)
· FCOM 4.02.30 (Flight Guidance Principles)
04 - INSTRUCTOR’S ACTIONS
Briefing of the following key points.
MAIN
· FMA annunciations
· Crew coordination
· Reasons for reversion modes
SECONDARY
· Flight guidance principles
A319/A320/A321
FLIGHT CREW TRAINING MANUAL
1.02.35 Page 1
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NORMAL OPERATION BRIEFINGS
FLIGHT DIRECTOR MODE REVERSIONS
CHAP02\35
05 - TRAINEES’ ACTIONS
REVERSION DUE TO FCU ALTITUDE CHANGE
This reversion is caused when there is pilot action on the ALT selector knob while the aircraft
is climbing or descending. It applies equally whether the aircraft is being hand flown or if the
autopilot is engaged.
VERTICAL MODE ENGAGED
FCU ALTITUDE SELECTION
CHANGE
VERTICAL MODE SWITCHES
TO
CLB, OP CLB, EXP CLB Below current altitude V/S on current V/S
DES, OP DES, EXP DES Above current altitude V/S on current V/S
ALT* active Any change V/S on current V/S
REVERSION DUE TO LOSS OF NAV MODE
This reversion is caused by loss of NAV mode, for example selecting a HDG, or when
entering a discontinuity. Again, this applies whether the aircraft is being hand flown or
through the autopilot.
CONDITIONS EVENT CONSEQUENCE
CLB engaged Loss of the lateral managed
mode : NAV
OP CLB engages
DES engaged Loss of the lateral managed
mode : NAV
V/S engages
REVERSION WHEN FD ORDERS ARE NOT FOLLOWED
These reversions occur when the aircraft is in manual flight and the pilot fails to follow the FD
bars.
CONDITIONS EVENT CONSEQUENCE
FD engaged
AP Off
A/THR active (IDLE thrust)
DES, OP DES
or EXP DES engaged
IAS = VLS - 2 kts
IAS = VLS - 17 kts
(if speedbrakes extended)
Automatic engagement of SPD
mode on A/THR, and
consequently of V/S (FPA)
mode on FD to regain the
target speed, or VLS,
whichever is the greater.
FD engaged
AP Off
A/THR active (CL thrust)
CLB, OP CLB
or EXP CLB engaged
IAS = VMAX + 4 kts where
VMAX = VFE or VLE or
VMO/MMO
Automatic engagement of SPD
mode on A/THR, and
consequently of V/S (FPA)
mode on FD to regain the
target speed, or VMAX,
whichever is lower.
A319/A320/A321
FLIGHT CREW TRAINING MANUAL
1.02.35 Page 2
REV 21 MAY 98
NORMAL OPERATION BRIEFINGS
FLIGHT DIRECTOR MODE REVERSIONS
CHAP02\35
05 - TRAINEES’ ACTIONS (END)
REVERSION DUE TO EXCESSIVE V/S
When an excessive V/S has been selected, the aircraft cannot achieve the V/S demanded.
The airplane is trying to maintain a V/S and a speed, but the priority is to maintain the V/S.
When this is not possible, speed will decrease (climbing) or increase (descending) up to a
maximum. After this point, a mode reversion will occur to protect the airplane from entering a
potentially hazardous situation. The table below explains the consequences of selecting
excessive V/S and the reversions. They apply equally with autopilot engaged or not.
CONDITIONS REVERSION OCCURS WHEN CONSEQUENCE
Excessive V/S - FPA > 0
selected
IAS = VLS + 5 kt
Open mode engages in order
to regain the target speed.
Excessive V/S - FPA < 0
selected and clean
configuration
IAS = VMAX - 5 kt where
Vmax = VMO/MMO
OP CLB engages when the
FCU selected altitude is higher
than the current airplane
altitude.
Excessive V/S - FPA < 0
selected and configuration other
than clean
IAS = Vmax + 4 kt where
Vmax = VFE or VLE
OP DES engages when the
FCU selected altitude is lower
than the current airplane
altitude.
The reversions with autopilot engaged can be demonstrated using the FMGS Freeplay
Trainer.
Reversions are recognised by monitoring the FMA.
06 - COMPLETION STANDARDS
· Demonstrates a thorough knowledge and understanding of flight guidance and the various
reversion modes
07 - COMMON ERRORS
· Lack of appreciation of flight guidance reversions
· Incorrect procedure following reversions
A319/A320/A321
FLIGHT CREW TRAINING MANUAL
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REV 21 MAY 98
NORMAL OPERATION BRIEFINGS
FLIGHT DIRECTOR MODE REVERSIONS
CHAP02\35
PAGE LEFT INTENTIONALLY BLANK
A319/A320/A321
FLIGHT CREW TRAINING MANUAL
1.02.35 Page 4
REV 21 MAY 98
NORMAL OPERATION BRIEFINGS
FLIGHT DIRECTOR MODE REVERSIONS
CHAP02\35
01 - TRAINING OBJECTIVE
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