AMC3 CAT.OP.MPA.110 Aerodrome operating minima

CAA ORS9 Decision No. 47

DETERMINATION OF DH/MDH FOR INSTRUMENT APPROACH OPERATIONS — AEROPLANES

  1. The decision height (DH) to be used for a 3D approach operation, or a 2D approach operation flown using the continuous descent final approach (CDFA) technique, should not be lower than the highest of:

    1. the obstacle clearance height (OCH) for the category of aircraft;

    2. the published approach procedure DH or minimum descent height (MDH) where applicable;

    3. the system minima specified in Table 4;

    4. the minimum DH permitted for the runway specified in Table 5; or

    5. the minimum DH specified in the aircraft flight manual (AFM) or equivalent document, if stated.

  2. The MDH for a 2D approach operation flown not using the CDFA technique should not be lower than the highest of:

    1. the OCH for the category of aircraft;

    2. the published approach procedure MDH where applicable;

    3. the system minima specified in Table 4;

    4. the lowest MDH permitted for the runway specified in Table 5; or

    5. the lowest MDH specified in the AFM, if stated.

Table 4

System minima — aeroplanes

Facility

Lowest DH/MDH (ft)

ILS/MLS/GLS

200

GNSS/SBAS (LPV)

200*
Precision approach radar (PAR) 200
GNSS/SBAS (LP) 250

GNSS (LNAV)

250

GNSS/Baro VNAV (LNAV / VNAV)

250

LOC with or without DME

250

SRA (terminating at ½ NM)

250

SRA (terminating at 1 NM)

300

SRA (terminating at 2 NM or more)

350

VOR

300

VOR/DME

250

NDB

350

NDB/DME

300

VDF

350

* For localiser performance with vertical guidance (LPV), a DH of 200 ft may be used only if the published FAS datablock sets a vertical alert limit not exceeding 35 m. Otherwise, the DH should not be lower than 250 ft.

Table 5

Runway type minima — aeroplanes

Runway type Approach type Lowest DH/MDH (ft)
Instrument runway Precision approach (PA) runway, category I 200
Instrument runway NPA runway 250
Non-Instrument runway Non-instrument runway Circling minima as shown in Table 15

 

  1. Where a barometric DA/H or MDA/H is used, this should be adjusted where the ambient temperature is significantly below international standard atmosphere (ISA). GM8 CAT.OP.MPA.110 ‘Low temperature correction’ provides a cold temperature correction table for adjustment of minimum promulgated heights/altitudes.