ED Decision 2022/012/R
DETERMINATION OF DH/MDH FOR INSTRUMENT APPROACH OPERATIONS — AEROPLANES
(a) 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.
(b) 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) |
|
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 |
* 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 |
Lowest DH/MDH (ft) |
|
Instrument runway |
Precision approach (PA) runway, category I |
200 |
NPA runway |
250 |
|
Non-Instrument runway |
Non-instrument runway |
Circling minima as shown in Table 15 |
(c) 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.
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