BUMI HILLS AIRSTRIP RADIO PROCEDURE FOR BUMI MOBILE RUNWAY CLEARING VEHICLES

Due to the potential danger caused by wild animals freely roaming around the Bumi Hills airstrip, a vehicle, equipped with hand-held aviation radio, shall be required to clear the runway whenever aircraft are landing or taking off from there. 

RUNWAYS

There are two runways on the airstrip at Bumi, and they are named using the magnetic bearing which an aircraft would be facing with respect to north when lined up with that runway, divided by 10. e.g. if the magnetic bearing of the runway is 270º, then the runway would be 270÷10=27. They are:

  1. Runway 09- Bearing 090 degrees from magnetic north. With an observer at the aircraft parking area, facing the runways, an aircraft using runway 09 would pass from their left side, going towards their right, towards the harbour.
  2. Runway 27- Bearing 270 degrees from magnetic north. With an observer at the aircraft parking area, facing the runways, an aircraft using runway 27 would pass from their right side, going towards their left, away from the harbour.

ACTIVE RUNWAY

The term “active runway” is the runway which is being used for takeoff and landing. This is determined by the direction of the wind. Aircraft will always takeoff as much into the wind as possible. To help the pilots determine the wind direction, the wind sock is used. Pilots will takeoff and land in the direction which is opposite to where the wind sock is pointing e.g. in the diagram of Bumi Airstrip, on the first page of this document, the active runway would be Runway 09.

RADIO FREQUENCY

The frequency for Bumi Airstrip is 118.7MHz. This is the frequency used at all uncontrolled airfields.

AIRCRAFT IDENTIFICATION

Aircraft are identified by the registration letters written on their sides, using the phonetic alphabet.

E.g. an aircraft with registration Z-WSM will be identified as Zulu Whiskey Sierra Mike on the radio.

To aid in quickly recognizing the aircraft, pilots will usually mention the aircraft type, and colour/markings after the registration.

VEHICLE IDENTIFICATION

The identification of the vehicle equipped with the radio shall be BUMI MOBILE

RADIO CHECK

To ensure that there is two-way communication between aircraft, and the ground, Bumi Mobile shall initiate a radio check. For the correct times of initiating the radio check, please refer to the page entitled “RADIO CALLS”

Example of a radio check

Bumi Mobile: ZULU WHISKEY SIERRA MIKE, BUMI MOBILE, RADIO CHECK.

Aircraft: BUMI MOBILE, ZULU WHISKEY SIERRA MIKE, READ YOU FIVE

Bumi Mobile: ZULU WHISKEY SIERRA MIKE, BUMI MOBILE, READ YOU FIVE

RADIO READBILITY SCALE

Below is the scale used to assess how easy or difficult it is to read a transmission:

  1. Unreadable
  2. Barely readable, occasional words distinguishable
  3. Readable with considerable difficulty
  4. Readable with practically no difficulty
  5. Perfectly readable

RADIO CALLS

Arrival

The pilot will usually make his/her first call to Bumi Hills Lodge when he/she is about 10 – 15 minutes from landing. In this call, they will state their estimated time of arrival ETA.

The next series of calls will be when they are within the vicinity of the airstrip. During these calls Bumi Mobile should take note of the aircraft’s registration.

Once Bumi Mobile has the aircraft in sight, the driver/radio operator shall initiate a radio check. E.g. “ZULU WHISKEY SIERRA MIKE, BUMI MOBILE RADIO CHECK, HOW DO YOU READ”

When the pilot is on final approach to land, he/she shall call “ZULU WHISKEY SIERRA MIKE FINAL RUNWAY 90 TO LAND”

If the runway is clear Bumi Mobile should respond by saying “ZULU WHISKEY SIERRA MIKE CLEARED TO LAND RUNWAY 09”

If there are animals on the runway Bumi Mobile shall say “ZULU WHISKEY SIERRA MIKE GO AROUND GO AROUND, RUNWAY 09 NOT CLEAR.”

Departure

The pilot will usually make his/her first call just after starting the engines.

Once the aircraft begins to move, the driver/radio operator shall initiate a radio check. E.g. “ZULU WHISKEY SIERRA MIKE, BUMI MOBILE RADIO CHECK, HOW DO YOU READ”

The next series of calls will be when they are entering the runway and lining up. During these calls Bumi Mobile should take note of the aircraft’s registration.

When the pilot is beginning the takeoff role, he/she shall call “ZULU WHISKEY SIERRA MIKE TAKING OFF RUNWAY 90 TO LAND” OR “ZULU WHISKEY SIERRA MIKE ROLLING”

If the runway is clear Bumi Mobile should respond by saying “ZULU WHISKEY SIERRA MIKE CLEARED FOR TAKEOFF RUNWAY 09”

If there are animals on the runway Bumi Mobile shall say “ZULU WHISKEY SIERRA MIKE HOLD POSITION HOLD POSITION, RUNWAY 09 NOT CLEAR.”