UVC Questions

Question 0

OCL/ORCA

Answer 0

Oceanic route clearance authorisation (for planners)

Question 1

TOI validity?

Answer 1

Up to 6 months.

Can be reissued if needed for longer

Question 2

When do aircraft request clearance?

Answer 2

At least 30 and no more than 90 minutes before the estimate for OCA boundary

Question 3

Frequency - a/c registered west of 30 west

Answer 3

123.95

Question 4

Frequency - a/c registered east of 30 west

Answer 4

127.65

Question 5

EIAA (Ballygirreen) South

Answer 5

127.9

Used as far as practicable when East of 20 west to reduce HF loading

Question 6

EIAA (Ballygirreen) north

Answer 6

124.175

Used as far as practicable when East of 20 west to reduce HF loading

Question 7

Frequency - emergency/guard

Answer 7

121.5

Question 8

Frequency - en route for pilot to pilot communications

Answer 8

123.45

Question 9

4 VHF transmitter locations

Answer 9

Dundonald hill - Ayrshire
Mangersta - Isle of Harris
Grantham - Lincolnshire
Davidstow Moor - Cornwall

Question 10

NARTEL

Answer 10

North Atlantic radio telephony

5 HF frequency families A-F (excluding E)

Question 11

NAT A HF frequencies

Answer 11

Aircraft flying routes with coordinates between 43N - 47N

Question 12

NAT B HF frequencies

Answer 12

Aircraft flying routes with coordinates between 47N - 64N

Aircraft registered west of 30 west

Question 13

NAT C HF frequencies

Answer 13

Aircraft flying routes with coordinates between 47N - 64N

Aircraft registered east of 30 west

Question 14

NAT D HF frequencies

Answer 14

Aircraft flying routes with coordinates north of 62N

Question 15

NAT F HF frequencies

Answer 15

Assigned to aircraft flying routes entirely within the gander and shanwick area

Assigned on a tactical basis and coordinated between gander and shanwick radio

Question 16

Message not delivered

Answer 16

Shanwick advised:

After not more than 10 minutes

After not more than 8 minutes if marked PRIORITY

Immediate delivery - shanwick radio must be advised by telephone and a hard copy must be sent

Question 17

ORCA

Answer 17

Oceanic route clearance authorisation

Issues clearance to westbound flights entering shanwick along domestic boundary from ATSIX to PASAS

Question 18

ARINC 623

Answer 18

Request clearance
Receive clearance
Acknowledge clearance

Question 19

ARINC 620

Answer 19

Request clearance
Receive clearance
Cannot acknowledge clearance, must be read back via CDO

Question 20

ADS

Answer 20

Automatic dependant surveillance

Allows FMC to make automatic position reports without pilot input

More accurate than HF

Question 21

Services provided by en route controller

Answer 21

At and above FL55:

Air traffic control
Flight information service
Alerting service

Below FL55:
Flight information service

Alerting service