Document ID: chunk:federal_register_of_legislation:F2022C00813:reg:300:p17
Version: federal_register_of_legislation:F2022C00813
Segment Type: reg
Provision Reference: reg 300 (pt 17/27)
Character Range: 115397–118360

rounded up but must not be rounded down;

(g)         radar tracking must be maintained from the VF to the ATP.

8.6.4.4              Radio altimeters. For determining landing minima, fluctuations in measured radio altitude caused by ocean swell may be disregarded if the fluctuations are less than 50 ft about the observed mean.

8.6.4.5              Obstacle clearance check. Before descent from the MSA, the obstacle clearance check must be conducted:

(a)         to validate the radar ATP return by:

(i)            cross-reference to:

(A)        another navigation facility (for example, GNSS); and

(B)        the last known position reported by the facility; and

(ii)          resolving any discrepancy in position before commencing the approach; and

(b)         to detect and locate any radar returns:

(i)            between the helicopter and the ATP; or

(ii)          in the vicinity of the ATP; and

       Note   For a method to conduct an obstacle clearance check and ensure that the aircraft does not descend below the radar vertical beam width, see AC 173-5.

8.6.5                   Types of procedures

8.6.5.1              When relying on airborne radar, a TIFP must use the following:

(a)         when the ATP is radar-reflective:

(i)            the radar — for azimuthal and distance guidance; and

(ii)          the GNSS — for confirmation of the radar picture;

(b)         when the ATP is not radar-reflective:

(i)            GNSS position of the ATP — for azimuthal and distance guidance; and

(ii)          the radar — for orientation.

8.6.5.2              The TIFP must be in the form of:

(a)         the direct approach described in paragraph 8.6.5.3; or

(b)         the overhead approach described in paragraph 8.6.5.4.

8.6.5.3              The direct approach. For the direct approach TIFP, the following apply:

(a)         the en route track to the ATP must proceed at or above MSA to the ATP as determined by GNSS via hand-entered coordinates or coordinates extracted from an electronic database;

(b)         the procedure must:

(i)            commence at the VF, located between 6 NM and 10 NM from the ATP; and

(ii)          proceed to the OIP, located 1.5 NM from the ATP;

(c)          the descent point must be located such that MDA/H is reached by 2 NM before the ATP;

(d)         at the OIP, the aircraft must be turned 15° left or right and proceed to the MAPt, located 0.75 NM radar or GNSS range from the ATP;

       Note   The MAPt is located 0.8 track miles from the OIP.

(e)         if the missed approach procedure is flown — at the MAPt, the aircraft must:

(i)            be turned an additional 30° in the same direction as it turned under paragraph (d); And

(ii)          commence the missed approach climb.

8.6.5.4              The overhead approach. For the overhead approach TIFP, the following apply:

(a)         the en route track to the ATP must proceed at or above MSA to overhead the