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OPERATING MANUAL
OPERATIONS ENGINEERING BULLETINS
ERRONEOUS RADIO ALTIMETER (RA) HEIGHT INDICATION
A330/A340 FLEET OEB-OEB1 P 3/8
FCOM 19 AUG 10
M Localization T DU Title DU identification DU date
OEB-OEB1 Erroneous Radio Altimeter (RA) Height
Indication
FG01081
OEB-OEB1 Erroneous Radio Altimeter (RA) height
indication - Approval
00012331.0001001 09 MAR 10
Criteria: LR
Applicable to: ALL
OEB-OEB1 Erroneous Radio Altimeter (RA) height
indication - Description
00012332.0001001 09 MAR 10
Criteria: LR
Applicable to: ALL
OEB-OEB1 Erroneous Radio Altimeter (RA) height
indication - Procedure
00012333.0001001 09 MAR 10
Criteria: LR
Applicable to: ALL
OEB-OEB1 Erroneous Radio Altimeter (RA) Height
Indication - Corrective Action
00012334.0001001 09 MAR 10
Criteria: LR
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
OPERATIONS ENGINEERING BULLETINS
ERRONEOUS RADIO ALTIMETER (RA) HEIGHT INDICATION
A330/A340 FLEET OEB-OEB1 P 4/8
FCOM 19 AUG 10
Applicable to: ALL
EXPLANATION
If an RA transmits erroneous height indication, this may have any of the following effects on
aircraft systems depending on the flight phase. However, these effects may not necessarily occur
in every case of an erroneous RA height indication.
On the Primary Flight Display (PFD):
The RA height indication (possibly negative) is frozen ‐ and appears in either amber or green
depending on the height
‐ Discrepancy between both PFDs (RA indications, FD orders, and if both AP engaged, PFD
FMAs)
On the System Display (SD):
‐ A pulsing Cabin Differential Pressure Advisory appears on CAB PRESS page (No consequence
on cabin pressure)
Warnings / Callouts:
‐ Untimely Terrain Awareness and Warning System (TAWS) alerts
‐ Untimely or absence of “RETARD” callout
‐ Untimely L/G GEAR NOT DOWN ECAM warning
‐ Absence or interruption of RA automatic callout (height announcement)
‐ Activation of AUTOLAND warning light in ILS (or MLS, GLS) approach (Refer to FCOM DSC
22_30 - Auto Flight - Flight Guidance) with AP engaged in LAND or FLARE mode when:
• One RA height goes below 200 feet and
• The difference between both RA height indications is greater than 15 feet
Note: There is no ECAM message or audio warning in association to the AUTOLAND
warning light. The AUTOLAND warning can be triggered even if AUTOLAND is not
planned
A330/A340 FLIGHT CREW
OPERATING MANUAL
OPERATIONS ENGINEERING BULLETINS
ERRONEOUS RADIO ALTIMETER (RA) HEIGHT INDICATION
A330/A340 FLEET OEB-OEB1 P 5/8
FCOM 19 AUG 10
Auto Flight System mode changes (indicated on FMA):
‐ NAV mode engagement not possible after take off
‐ During an ILS (or MLS, GLS) approach, and depending on the engaged Flight Guidance (FG)
modes, the consequences may be:
• Untimely/early engagement of the LAND / FLARE / THR IDLE modes if the RA height used
by the FG is erroneous and lower than the real height.
Note: During ILS (or MLS, GLS) approach with AP and A/THR engaged, THR IDLE
(RETARD) mode untimely engagement will be associated with an initial pitch
attitude increase due to FLARE mode engagement.
• In AUTOLAND, the LAND / FLARE / THR IDLE modes will not engage, if the RA height used
by the FG is erroneous and higher than the real height.
• In case of Go-Around and if the RA is still frozen at a very low height indication:
▪􀀃SRS􀀃and􀀃GA􀀃TRK􀀃modes􀀃engage􀀃
▪􀀃NAV,􀀃HDG􀀃or􀀃TRK􀀃lateral􀀃modes􀀃cannot􀀃be􀀃selected􀀃
▪􀀃LVR􀀃CLB􀀃will􀀃not􀀃be􀀃displayed􀀃on􀀃the􀀃FMA􀀃at􀀃THR􀀃RED􀀃ALT􀀃
▪􀀃ALT*􀀃and􀀃ALT􀀃will􀀃not􀀃engage􀀃at􀀃FCU􀀃altitude􀀃
Disconnecting AP and resetting both FDs enable to recover basic modes (HDG and V/S).
During an ILS (or MLS, GLS) approach with AP engaged, if an erroneous and very low RA
height indication occurs, THR IDLE and FLARE modes may engage early with the following
consequences:
The High Angle of ‐ Attack autopilot disconnection is not available. As a consequence the
autopilot􀀃will􀀃not􀀃automatically􀀃disconnect􀀃at􀀃α􀀃prot􀀃+1°.􀀃If􀀃the􀀃flight􀀃crew􀀃does􀀃not􀀃immediately􀀃
　
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