1.17. Radio Altimeter Procedures

[If your aircraft is not equipped with a Radio Altimeter delete this section. This example caters to a single or dual Radio Altimeter Installation that has the following characteristics:
- can have an alert set independently at both the Pilot and Co-pilot positions,
- has individual digital displays to the pilot and co-pilot,
- is unable to resolve to the nearest foot, ie able to resolve to the nearest 5 ft or 10 ft,
- has an alert setting range that is less than the display range of the Radio Altimeter.
It will be necessary to write procedures based on the individual installation in your type of aircraft. However, the following areas will probably apply.
]

  1. General — The purpose of the procedures described in this section is to reduce the likelihood of inadvertent flight into terrain. These procedures should be adhered to unless a specific situation dictates a different procedure. In the event that these procedures are deviated from, the flight crew shall be fully briefed.
  2. Common Procedures — Unless unserviceable, both pilots shall have Radio Altitude and related alerting information continuously displayed. Unless desirable due to a special circumstance, both pilots Radio Altimeter Alert Height should be set to the same value.
  3. Category I Precision Approach Procedures — The Radio Altimeter Alert Height should be set to the HAT that corresponds to the DH for the approach flown. If the HAT does not correspond to an even increment for the Radio Altimeter Alert both pilots should set their Alert Height to [choose one of the following based on consideration of aircraft equipment and company policy: the nearer increment, the next lower increment, the next higher increment]. In no case is the radio altimeter be used to determine the DH.
  4. Category II/III Precision Approach Procedures [If your operation does not do Category II or III Precision Approach Procedures delete this section.] — The procedures for use of the Radio Altimeter(s) for Category II and Category III Precision Approach are found in the chapter that deals with Normal Flight Procedures Arrival.
  5. Non-precision Approach Procedures — For Non-precision approaches the Radio Altimeter Alert Height for both pilots should be set to [insert company policy]. In no case is the radio altimeter be used to determine the MDA.

[For Non-precision approaches there are a number of possibilities for setting of alert heights. Some of the options and considerations are:
- set to the HAA/HAT that corresponds to the approach being flown;
- set the Required Obstacle Clearance for the approach being flown (this option has some advantage for approaches which have very high HAA's or HAT's, particularly if the HAA/HAT is above the setting range for the alert);
- set a specific value based on company policy, equipment limitations, or type of operation;
- if the selected height does not correspond to an even increment for the Radio Altimeter Alert it should be specified which of the following is to be set: the nearer increment, the next lower increment, the next higher increment.
]

  1. Procedures for other than Instrument Approaches — For en route operations the Radio Altimeter Alert for both pilots should be set to [insert company policy, eg. 500 ft, 1000 ft, 1500 ft]. [If applicable specify procedures for special operations such as aerial work.]

 
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