Learn how to read the Airbus A380 airspeed indicator, target bugs, trend arrow, Mach display, VMO/MMO and moving speed-limit bands.
On the Airbus A380 PFD, read indicated airspeed in knots where the moving left-hand speed tape crosses the fixed yellow reference line. The Mach readout becomes relevant at altitude. Treat the upper red-and-black strip as the active maximum limit; lower amber and red markings show minimum-speed and angle-of-attack protection boundaries.
In our Aviation & Real-World Flying coverage, the crucial distinction is that the tape shows indicated airspeed (IAS), not true airspeed or groundspeed. A faithful A380 simulator should follow the same convention. Our explanation of why pilots use IAS and Mach during different phases covers the underlying relationship.
How do you read the A380 speed tape?
Read the aeroplane's present speed first, then check the target, trend and limiting marks around it.
- Read current IAS at the centre. The numbered scale moves vertically behind the fixed yellow reference line. The number crossing that line is the present indicated airspeed in knots.
- Find the target-speed symbol. A managed FMS target is normally magenta, while a speed selected manually on the FCU is normally cyan or blue. An off-scale target may appear numerically above or below the visible tape.
- Check the yellow trend vector. Its tip predicts where IAS will be in roughly ten seconds if the present acceleration or deceleration continues. It is a prediction, not a commanded speed.
- Check both limit areas. The upper red-and-black strip marks the active maximum speed. Low-speed amber and red markings show VLS and angle-of-attack-related protection boundaries.
- Cross-check Mach at altitude. The Mach indication appears near the speed scale when relevant. During high-altitude flight, Mach can become limiting even though IAS remains well below 340 knots.
What do the A380 speed tape colours and symbols mean?
The A380 combines fixed limits, computed reference speeds and dynamic protection boundaries on one display.
| Marking | Meaning | How to use it |
|---|---|---|
| Yellow centre reference | Present indicated airspeed | Read IAS where the moving scale crosses this line. |
| Magenta target | Managed speed from the flight-management system | Use when the aircraft is operating in managed speed mode. |
| Cyan or blue target | Speed selected on the FCU | Use for an ATC restriction or a deliberately selected speed. |
| Yellow trend vector | Predicted IAS in about ten seconds | Use it to anticipate an overspeed or low-speed condition before reaching the boundary. |
| Upper red-and-black strip | VMAX, the lowest applicable maximum-speed limit | Do not enter the strip or use its edge as a normal target. |
| Amber VLS mark | Lowest selectable speed calculated for the configuration | Remain above it in normal operation; VLS is not simply the published stall speed. |
| Amber/black and red low-speed bands | Alpha-protection and alpha-maximum regions | These are largely angle-of-attack-derived boundaries and depend on flight-control law. |
| Green dot | Clean-configuration manoeuvring and reference speed | Use it as the Airbus clean reference, not as an absolute minimum speed. |
| S and F | Slat and flap retraction reference speeds | Use them with the normal acceleration and configuration sequence. |
| V1, VR and V2 marks | Calculated take-off reference speeds | They appear only when valid take-off performance data have been entered or generated. |
Exact rendering can differ in simplified simulator aircraft, but a high-fidelity implementation should preserve these functions. Missing take-off marks usually indicate incomplete performance data rather than a failed PFD.
What are the Airbus A380 maximum speed limits?
For the A380-800, the clean-aircraft maximum operating limit is VMO 340 KIAS or MMO Mach 0.89, whichever is reached first.
At lower altitude, the IAS limit normally dominates. At higher altitude, the Mach limit becomes active and the red-and-black strip moves accordingly; there is no single crossover altitude valid for every atmospheric condition. Our guide to how the moving maximum-speed barber pole behaves explains this change in more detail.
The displayed VMAX may be lower than 340 KIAS or Mach 0.89 because it reflects the most restrictive applicable limit:
- VFE for the present slat or flap configuration.
- VLE when the landing gear is extended.
- VMO/MMO when the aircraft is clean.
- A reduced limit associated with certain failures, where represented by the aircraft systems.
Gear movement also has separate VLO extension and retraction limits, so the PFD barber pole alone does not tell the crew when the gear may be operated. Likewise, a VFE NEXT mark relates to the next flap configuration; it is not a target speed.
VMO/MMO is an operating boundary, not a recommended cruise setting. The A380 commonly cruises around Mach 0.85, but the actual target comes from the flight plan, cost index, weight, altitude and operating conditions. Normal Law protections are backups rather than permission to fly against a limit, and degraded control laws may remove or alter those protections.
Which A380 speed should you actually fly?
Fly the calculated or selected target speed, not VLS or the edge of the red-and-black strip.
- Take-off: use the calculated V1, VR and V2 for that runway, weight, configuration and weather. A single hard-coded A380 rotation speed is not valid.
- Climb, cruise and descent: follow the managed FMS target unless ATC or the procedure requires a selected speed.
- Approach: fly the computed VAPP rather than sitting on VLS. Wind correction, landing weight and configuration affect the target; our guide to controlling A380 approach and landing speed in a simulator covers that phase.
- Configuration changes: use the S and F references with the normal flap-retraction sequence while still respecting VFE and VFE NEXT.
A target symbol does not prove that autothrust is controlling speed. Confirm the active and armed modes on the Flight Mode Annunciator; otherwise, the target can remain displayed while thrust or pitch is being controlled in a different mode.
Why can the A380 speed indication look wrong in a simulator?
Most apparent A380 speed-tape errors come from incomplete performance data, the wrong configuration or confusing IAS with another speed measurement.
- If V1, VR, V2 or VAPP is absent, check the entered weight, flap configuration and relevant performance entries.
- If the upper limit suddenly moves down, check flap position, landing gear, flight-control law and any ECAM failure messages.
- If groundspeed differs sharply from the PFD tape, that can be normal because wind affects groundspeed but the tape displays IAS.
- If captain, first-officer and standby indications disagree or freeze, treat it as an air-data problem rather than a moving speed limit. Check pitot/static conditions, icing, heating and simulated failures; our troubleshooting advice covers diagnosing a stopped or implausible airspeed indicator.
- If only one add-on omits colours or markers, it may not model the full A380 display logic. Use that aircraft's documented implementation rather than assuming every visual cue is functional.