AMC11 CAT.OP.MPA.110 Aerodrome operating minima
CAA ORS9 Decision No. 47
Text in magenta in force from 30 October 2025
EFFECT ON LANDING MINIMA OF TEMPORARILY FAILED OR DOWNGRADED GROUND EQUIPMENT
(a) General
These instructions are intended for use both pre-flight and in-flight. It is, however, not expected that the commander would consult such instructions after passing 1 000 ft above the aerodrome. If failures of ground aids are announced at such a late stage, the approach could be continued at the commander’s discretion. If failures are announced before such a late stage in the approach, their effect on the approach should be considered as described in Table 9, and the approach may have to be abandoned.
(b) Conditions applicable to Table 9:
(1) multiple failures of runway/FATO lights other than indicated in Table 9 should not be acceptable;
(2) deficiencies of approach and runway/FATO lights are treated separately; and
(3) failures other than ILS, MLS affect RVR only and not DH.
Table 9
Failed or downgraded equipment — effect on landing minima Operations without a low visibility operations (LVO) approval
|
Failed or downgraded equipment |
Effect on landing minima |
|
|---|---|---|
|
CAT I |
APV, NPA |
|
|
ILS/MLS stand‑by transmitter |
No effect |
|
|
Outer Marker |
Not allowed except if replaced by height check at 1 000 ft |
APV — not applicable |
|
NPA with FAF: no effect unless used as FAF |
||
|
If the FAF cannot be identified (e.g. no method available for timing ofdescent), non-precision operations cannot be conducted |
||
|
Middle marker |
No effect |
No effect unless used as MAPt |
|
RVR Assessment Systems |
No effect |
|
|
Approach lights |
Minima as for NALS |
|
|
Approach lights except the last 210 m |
Minima as for BALS |
|
|
Approach lights except the last 420 m |
Minima as for IALS |
|
|
Standby power for approach lights |
No effect |
|
|
Edge lights, threshold lights and runway end lights |
Day: no effect; Night: not allowed |
|
|
Centreline lights |
No effect if F/D, HUDLS or auto-land otherwise RVR 750 m |
No effect |
|
Centreline lights spacing increased to 30 m |
No effect |
|
|
Touchdown zone lights |
No effect if F/D, HUDLS or auto-land; otherwise RVR 750 m |
No effect |
|
Taxiway lighting system |
No effect |
|
The text below will replace the text above on 30 October 2025:
EFFECT ON LANDING MINIMA OF TEMPORARILY FAILED OR DOWNGRADED GROUND EQUIPMENT
-
General
These instructions are intended for use both before and during flight. Only those facilities mentioned in Table 17 should be acceptable to be used to determine the effects of temporarily failed or downgraded equipment. It is, however, not expected that the commander would consult such instructions after passing 1 000 ft above the aerodrome. If failures of ground aids are announced at such a late stage, the approach could be continued at the commander’s discretion. If failures are announced before such a late stage in the approach, their effect on the approach should be considered as described in Table 17, and the approach may have to be abandoned.
-
Conditions applicable to Table 17:
-
multiple failures of runway/FATO lights other than those indicated in Table 17 should not be acceptable;
-
failures of approach and runway/FATO lights are acceptable at the same time, and the most demanding consequence should be applied; and
-
failures other than ILS, GLS, MLS affect RVR only and not the DH.
-
Table 17
Failed or downgraded equipment — effect on landing minima
Operations without an LVO approval
|
Effect on landing minima |
||
|---|---|---|
|
Failed or downgraded equipment |
Type B |
Type A |
| Navaid stand-by transmitter | No effect | No effect |
| Outer marker | For CAT I: Not allowed except if the required height versus glide path can be checked using other means, e.g. DME fix |
APV —not applicable |
|
NPA with final approach fix (FAF): no effect unless used as FAF |
||
|
If the FAF cannot be identified (e.g. no method available for timing of descent), NPA operations cannot be conducted |
||
|
FOR CAT I: Not allowed except if the required height versus glide path can be checked using other means, e.g. DME fix |
||
| Middle marker (ILS only) | No effect | No effect unless used as MAPt |
| DME | No effect if replaced by RNAV (GNSS) information or the outer marker | No effect if replaced by RNAV (GNSS) information or the outer marker |
|
RVR assessment Systems |
No effect | No effect |
|
Approach lights |
Minima as for NALS | Minima as for NALS |
|
Approach lights except the last 210 m |
Minima as for BALS | Minima as for BALS |
|
Approach lights except the last 420 m |
Minima as for IALS | Minima as for IALS |
|
Standby power for approach lights |
No effect | No effect |
|
Edge lights, threshold lights and runway end lights |
Day: no effect; Night: not allowed | Day: no effect; Night: not allowed |
|
Centre line lights |
Aeroplanes: No effect if flight director (F/D), HUDLS or autoland; otherwise RVR 750 m Helicopters: No effect on CAT I and HELI SA CAT I approach operations |
No effect but the minimum RVR should be 750 m |
|
Centre line lights spacing increased to 30 m |
No effect | No effect |
|
TDZ lights |
Aeroplanes: No effect if F/D, HUDLS or autoland; otherwise RVR 750 m Helicopters: No effect |
No effect |
|
Taxiway lighting system |
No effect | No effect |