GM4 NCO.OP.110 Aerodrome operating minima – aeroplanes and helicopters
CAA ORS9 Decision No. 1
DETERMINATION OF RVR/CMV/VIS MINIMA FOR NPA, APV, CAT I — AEROPLANES
(a) The minimum RVR/CMV/VIS should be the highest of the values specified in Table 2 and Table 3.A but not greater than the maximum values specified in Table 3.A, where applicable.
(b) The values in Table 2 should be derived from the formula below:
required RVR/VIS (m) = [(DH/MDH (ft) x 0.3048) / tanα] – length of approach lights (m);
where α is the calculation angle, being a default value of 3.00° increasing in steps of 0.10° for each line in Table 2 up to 3.77° and then remaining constant.
(c) If the approach is flown with a level flight segment at or above MDA/H, 200 m should be added for Category A and B aeroplanes and 400 m for Category C and D aeroplanes to the minimum RVR/CMV/VIS value resulting from the application of Table 2 and Table 3.A.
(d) An RVR of less than 750 m, as indicated in Table 2, may be used:
(1) for CAT I operations to runways with full approach lighting system (FALS), runway touchdown zone lights (RTZL) and runway centreline lights (RCLL);
(2) for CAT I operations to runways without RTZL and RCLL when using an approved head-up guidance landing system (HUDLS), or equivalent approved system, or when conducting a coupled approach or flight-director-flown approach to a DH. The instrument landing system (ILS) should not be published as a restricted facility; and
(3) for approach procedure with vertical guidance (APV) operations to runways with FALS, RTZL and RCLL when using an approved head-up display (HUD).
(e) Lower values than those specified in Table 2 may be used for HUDLS and auto-land operations if approved in accordance with SPA.LVO.
(f) The visual aids should comprise standard runway day markings and approach and runway lights as specified in Table 1. The CAA may approve that RVR values relevant to a basic approach lighting system (BALS) are used on runways where the approach lights are restricted in length below 210 m due to terrain or water, but where at least one cross-bar is available.
(g) For night operations or for any operation where credit for runway and approach lights is required, the lights should be on and serviceable, except as provided for in Table 1.
(h) For single-pilot operations, the minimum RVR/VIS should be calculated in accordance with the following additional criteria:
(1) an RVR of less than 800 m, as indicated in Table 2, may be used for CAT I approaches provided any of the following is used at least down to the applicable DH:
(i) a suitable autopilot, coupled to an ILS, microwave landing system (MLS) or GBAS landing system (GLS) that is not published as restricted; or
(ii) an approved HUDLS, including, where appropriate, enhanced vision system (EVS), or equivalent approved system;
(2) where RTZL and/or RCLL are not available, the minimum RVR/CMV should not be less than 600 m; and
(3) an RVR of less than 800 m, as indicated in Table 2, may be used for APV operations to runways with FALS, RTZL and RCLL when using an approved HUDLS, or equivalent approved system, or when conducting a coupled approach to a DH equal to or greater than 250 ft.
Table 1: Approach lighting systems
Class of lighting facility |
Length, configuration and intensity of approach lights |
---|---|
FALS |
CAT I lighting system (HIALS ≥ 720 m) distance coded centreline, Barrette centreline |
IALS |
Simple approach lighting system (HIALS 420 – 719 m) single source, Barrette |
BALS |
Any other approach lighting system (HIALS, MIALS or ALS 210 – 419 m) |
NALS |
Any other approach lighting system (HIALS, MIALS or ALS < 210 m) or no approach lights |
Note: HIALS: high intensity approach lighting system; MIALS: medium intensity approach lighting system; ALS: approach lighting system.
Table 2: RVR/CMV vs. DH/MDH
DH OR MNH | Class of lighting facility | ||||
---|---|---|---|---|---|
FALS | IALS | BALS | NALS | ||
See (d), (e), (h). above for RVR < 750/800 m | |||||
ft | RVR/CMV (m) | ||||
200 - | 210 | 550 | 750 | 1000 | 1200 |
211 - | 220 | 550 | 800 | 1000 | 1200 |
221 - | 230 | 550 | 800 | 1000 | 1200 |
231 - | 240 | 550 | 800 | 1000 | 1200 |
241 - | 250 | 550 | 800 | 1000 | 1300 |
251 - | 260 | 600 | 800 | 1100 | 1300 |
261 - | 280 | 600 | 900 | 1100 | 1300 |
281 - | 300 | 650 | 900 | 1200 | 1400 |
301 - | 320 | 700 | 1000 | 1200 | 1400 |
321 - | 340 | 800 | 1100 | 1300 | 1500 |
341 - | 360 | 900 | 1200 | 1400 | 1600 |
361 - | 380 | 1000 | 1300 | 1500 | 1700 |
381 - | 400 | 1100 | 1400 | 1600 | 1800 |
401 - | 420 | 1200 | 1500 | 1700 | 1900 |
421 - | 440 | 1300 | 1600 | 1800 | 2000 |
441 - | 460 | 1400 | 1700 | 1900 | 2100 |
461 - | 480 | 1500 | 1800 | 2000 | 2200 |
481 - | 500 | 1500 | 1800 | 2100 | 2300 |
501 - | 520 | 1600 | 1900 | 2100 | 2400 |
521 - | 540 | 1700 | 2000 | 2200 | 2400 |
541 - | 560 | 1800 | 2100 | 2300 | 2500 |
561 - | 580 | 1900 | 2200 | 2400 | 2600 |
581 - | 600 | 2000 | 2300 | 2500 | 2700 |
601 - | 620 | 2100 | 2400 | 2600 | 2800 |
621 - | 640 | 2200 | 2500 | 2700 | 2900 |
641 - | 660 | 2300 | 2600 | 2800 | 3000 |
661 - | 680 | 2400 | 2700 | 2900 | 3100 |
681 - | 700 | 2500 | 2800 | 3000 | 3200 |
701 - | 720 | 2600 | 2900 | 3100 | 3300 |
721 - | 740 | 2700 | 3000 | 3200 | 3400 |
741 - | 760 | 2700 | 3000 | 3300 | 3500 |
761 - | 800 | 2900 | 3200 | 3400 | 3600 |
801 - | 850 | 3100 | 3400 | 3600 | 3800 |
851 - | 900 | 3300 | 3600 | 3800 | 4000 |
901 - | 950 | 3600 | 3900 | 4100 | 4300 |
951 - | 1000 | 3800 | 4100 | 4300 | 4500 |
1001 - | 1100 | 4100 | 4400 | 4600 | 4900 |
1101 - | 1200 | 4600 | 4900 | 5000 | 5000 |
1201 and above | 5000 | 5000 | 5000 | 5000 |
Table 3.A: CAT I, APV, NPA — aeroplanes
Minimum and maximum applicable RVR/CMV (lower and upper cut-off limits)
Facility/conditions |
RVR/CMV (m) |
Aeroplane category |
|||
---|---|---|---|---|---|
A |
B |
C |
D |
||
ILS, MLS, GLS, PAR, GNSS/SBAS, GNSS/VNAV |
Min |
According to Table 2 |
|||
Max |
1 500 |
1 500 |
2 400 |
2 400 |
|
NDB, NDB/DME, VOR, VOR/DME, LOC, LOC/DME, VDF, SRA, GNSS/LNAV with a procedure that fulfils the criteria in GM3 NCO.OP.110(a)(2) |
Min |
750 |
750 |
750 |
750 |
Max |
1 500 |
1 500 |
2 400 |
2 400 |
|
For NDB, NDB/DME, VOR, VOR/DME, LOC, LOC/DME, VDF, SRA, GNSS/LNAV:
— not fulfilling the criteria in GM3 NCO.OP.110(a)(2), or
— with a DH or MDH ≥ 1 200 ft |
Min |
1 000 |
1 000 |
1 200 |
1 200 |
Max |
According to Table 2 if flown using the CDFA technique, otherwise an add-on of 200/400 m applies to the values in Table 2 but not to result in a value exceeding 5 000 m. |
DETERMINATION OF RVR/CMV/VIS MINIMA FOR NPA, CAT I — HELICOPTERS
(a) For non-precision approach (NPA) operations, the minima specified in Table 4.1.H should apply:
(1) where the missed approach point is within ½ NM of the landing threshold, the approach minima specified for FALS may be used regardless of the length of approach lights available. However, FATO/runway edge lights, threshold lights, end lights and FATO/runway markings are still required;
(2) for night operations, ground lights should be available to illuminate the FATO/runway and any obstacles; and
(3) for single-pilot operations, the minimum RVR is 800 m or the minima in Table 2, whichever is higher.
(b) For CAT I operations, the minima specified in Table 4.2.H should apply:
(1) for night operations, ground light should be available to illuminate the FATO/runway and any obstacles;
(2) for single-pilot operations, the minimum RVR/VIS should be calculated in accordance with the following additional criteria:
(i) an RVR of less than 800 m should not be used except when using a suitable autopilot coupled to an ILS, MLS or GLS, in which case normal minima apply; and
(ii) the DH applied should not be less than 1.25 times the minimum use height for the autopilot.
Table 4.1.H: Onshore NPA minima
MDH (ft) * |
Facilities vs. RVR/CMV (m) **, *** |
|||
---|---|---|---|---|
FALS |
IALS |
BALS |
NALS |
|
250 – 299 |
600 |
800 |
1 000 |
1 000 |
300 – 449 |
800 |
1 000 |
1 000 |
1 000 |
450 and above |
1 000 |
1 000 |
1 000 |
1 000 |
*: The MDH refers to the initial calculation of MDH. When selecting the associated RVR, there is no need to take account of a rounding up to the nearest 10 ft, which may be done for operational purposes, e.g. conversion to MDA.
**: The tables are only applicable to conventional approaches with a nominal descent slope of not greater than 4°. Greater descent slopes will usually require that visual glide slope guidance (e.g. precision path approach indicator (PAPI)) is also visible at the MDH.
***: FALS comprise FATO/runway markings, 720 m or more of high intensity/medium intensity (HI/MI) approach lights, FATO/runway edge lights, threshold lights and FATO/runway end lights. Lights to be on. IALS comprise FATO/runway markings, 420 – 719 m of HI/MI approach lights, FATO/runway edge lights, threshold lights and FATO/runway end lights. Lights to be on.
BALS comprise FATO/runway markings, < 420 m of HI/MI approach lights, any length of low intensity (LI) approach lights, FATO/runway edge lights, threshold lights and FATO/runway end lights. Lights to be on. NALs comprise FATO/runway markings, FATO/runway edge lights, threshold lights, FATO/runway end lights or no lights at all.
Table 4.2.H: Onshore CAT I minima
DH (ft) * |
Facilities vs. RVR/CMV (m) **, *** |
|||
---|---|---|---|---|
FALS |
IALS |
BALS |
NALS |
|
200 |
500 |
600 |
700 |
1 000 |
201 – 250 |
550 |
650 |
750 |
1 000 |
251 – 300 |
600 |
700 |
800 |
1 000 |
301 and above |
750 |
800 |
900 |
1 000 |
*: The DH refers to the initial calculation of DH. When selecting the associated RVR, there is no need to take account of a rounding up to the nearest 10 ft, which may be done for operational purposes, e.g. conversion to DA.
**: The table is applicable to conventional approaches with a glide slope up to and including 4°.
***: FALS comprise FATO/runway markings, 720 m or more of HI/MI approach lights, FATO/runway edge lights, threshold lights and FATO/runway end lights. Lights to be on.
IALS comprise FATO/runway markings, 420 – 719 m of HI/MI approach lights, FATO/runway edge lights, threshold lights and FATO/runway end lights. Lights to be on.
BALS comprise FATO/runway markings, < 420 m of HI/MI approach lights, any length of LI approach lights, FATO/runway edge lights, threshold lights and FATO/runway end lights. Lights to be on.
NALS comprise FATO/runway markings, FATO/runway edge lights, threshold lights, FATO/runway end lights or no lights at all.