AMC11 CAT.OP.MPA.110 Aerodrome operating minima

EFFECT ON LANDING MINIMA OF TEMPORARILY FAILED OR DOWNGRADED GROUND EQUIPMENT

(a) 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 effect of temporarily failed of 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.

(b) Conditions applicable to Table 17:

(1) multiple failures of runway/FATO lights other than those indicated in Table 17 should not be acceptable;

(2) failures of approach and runway/FATO lights are acceptable at the same time, and the most demanding consequence should be applied; and

(3) failures other than ILS, GLS, MLS affect the RVR only and not DH.

Table 17

Failed or downgraded equipment — effect on landing minima

Operations without LVO approval

Failed or downgraded equipment	Effect on landing minima
	Type B	Type A
Navaid stand-by transmitter	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
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
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 750m.
Centre line lights spacing increased to 30 m	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