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Depending of the cause of the failure, the altitude indication may also be unreliable. There are
however, a number of correct indications available to the crew. GPS altitude and ground speed
are available on MCDU GPS monitor page and RA may be used at low level.
For affected ADR (s) identification, the flight crew may, either level off and stabilize the flight
using the dedicated table in PART 2, or, if for instance already stabilized in climb, use the
CLIMB table given in part 3. The trouble shooting will be more accurate, using the level off table.
LEVEL OFF AND STABILIZATION (IF REQUIRED)
The table gives the proper pitch and thrust values for stabilization in level off according to
weight, configuration and altitude.
It must be noticed that, if the altitude information is unreliable, FPV and V/S are also affected.
In this case, the GPS altitude, if available, is the only means to confirm when the aircraft is
maintaining a level. When reliable, the FPV should be used.
If the memory items have been maintained for a significant period of time, the current speed
may be quite above the target
A330/A340 FLIGHT CREW TRAINING MANUAL
ABNORMAL OPERATIONS
NAVIGATION
A330/A340 FLEET AO-034 P 12/14
FCTM 17 JUN 09
�� If FPV is reliable, or if GPS altitude information is available:
Maintain level flight (FPV on ‐ the horizon or constant GPS altitude)
‐ Adjust thrust according to the table
‐ Observe the resulting pitch attitude, and compare it with the recommended table pitch
target.
• If the aircraft pitch to maintain level flight is above the table pitch target, the aircraft is
slow, then increase thrust
• If the aircraft pitch to maintain level flight is below the table pitch target, the aircraft is
fast, then decrease thrust
When the pitch required to maintain level off gets close to the table pitch target, re-adjust
thrust according to table thrust target.
This technique permits to stabilize the speed quickly, without inducing altitude changes.
�� If FPV is not reliable and GPS altitude information is not available (no means to
ensure level flight):
Adjust pitch and thrust according to table, and wait for speed stabilization. Expect a
significant stabilization time and important altitude variations.
TROUBLE SHOOTING AND FAULT ISOLATION
When one indication differs from the others, flight crews may be tempted to reject the outlier
information. They should be aware, however, that in very extreme circumstances, it may happen
that two, or even all three ADRs may provide identical and erroneous data.
BEWARE OF INSTINCTIVELY REJECTING AN OUTLIER ADR
Once the affected ADR has (or have) been positively identified, it (they) should be switched
OFF. This will trigger the corresponding ECAM warnings and associated drills, which should be
followed to address all the consequences on the various aircraft systems.
In the extreme case where the affected ADR(s) cannot be identified and all speed indications
remain unreliable, 2 ADRs should be selected OFF to prevent the flight control laws from
using two coherent but unreliable ADR data. One must be kept ON to keep the stall warning
protection.
If at least one ADR remains reliable, the flight crew will use it (after having confirmed its
validity), and so, will stop the application of the ADR CHECK PROC / UNRELIABLE SPEED
INDICATION PROC.
PART 3: FLYING WITHOUT ANY SPEED REFERENCE
When the trouble shooting procedure did not permit to identify at least one correct indication, this
part of the procedure gives pitch/thrust reference to fly the aircraft safely, in all flight phases, down
to landing.
A330/A340 FLIGHT CREW TRAINING MANUAL
ABNORMAL OPERATIONS
NAVIGATION
A330/A340 FLEET AO-034 P 13/14
FCTM 17 JUN 09
The flight crew may enter directly this part if he knows already that no speed information is reliable
(for instance in case of dual pitot heating failure, plus an ADR failure), or if level off for trouble
shooting is not convenient from an operational point of view, for instance in descent, close to
destination.
When flying the aircraft with unreliable speed and/or altitude indications, it is recommended to
change only one flying parameter at a time i.e. speed, altitude or configuration. For this reason, a
wide pattern and a stabilized approach are recommended.
For final approach, if available, an ILS (with a -3 ° G/S) will ensure path guidance.
If final descent is started with stabilized speed (VAPP), flying a -3 ° flight path with the
recommended table thrust, the resulting pitch attitude should be close to the recommended table
pitch value. If an adjustment is required, vary the thrust, as explain in the initial level off paragraph.
　
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