Weather Forecasts

Question 1

Destination Aerodrome Forecast’s (TAF/TTF) are mandatory for IFR flights and must be valid….

Answer 1

30 mins before and 60 mins after planned ETA.

Question 2

If forecasts cannot be obtained then an IFR flight may depart without provided he is satisfied the departure the weather will permit a safe return within 1 hour of departure, PROVIDED

Answer 2

Updated forecast information must be accessed within 1 hour of departure.

Question 3

Area Forecasts (ARFOR) for operations below

Answer 3

FL 200

Question 4

The ARFOR cloud datum and validity required for a flight?

Answer 4

Cloud datum is MSL
AND
Must be valid for entire flight

Question 5

Terminal Aerodrome Forecast (TAF)

Answer 5

• Valid for airspace within 5nm of center of aerodrome runway complex

Question 6

TAF

Answer 6

• Used to determine alternate requirements

* Cloud datum is aerodrome elevation

Question 7

TAF

Answer 7

• Must be valid for 30 minutes before and 60 minutes after planed ETA
• 30 minute buffers apply to INTER/TEMPO or FM periods

Question 8

Trend Type Forecast (TTF)

Answer 8

• Valid for airspace within 5nm of center of aerodrome runway complex

Question 9

TTF

Answer 9

• Valid for 3 hours from time of observation
AND
• Replaces TAF for period of validity

Question 10

TTF

Answer 10

Replaces TAF for its period of validity

Question 11

Meteorological Reports and Advisories

Answer 11

METAR
SPECI
AIREP
SIGMET
AIRMET
Hazard Alerts
Approved observer

Question 12

INTER

Answer 12

Used to indicate changes in prevailing conditions of less than 30 minutes

Question 13

INTER

Answer 13

If changes below alternate minima 30 minutes holding or alternate is required

For TAF, 30 minute buffers apply either side of validity

If ETA is in buffer after the period only sufficient fuel to exit the buffer required

Question 14

TEMPO

Answer 14

Used to indicate changes in prevailing conditions of less than 60 minutes

Question 15

TEMPO

Answer 15

• If changes below alternate minima 60 minutes holding or alternate is required
• For TAF, 30 minute buffers apply either side of validity

Question 16

TEMPO

Answer 16

If ETA is in buffer after the period only sufficient fuel to exit the buffer required

Question 17

FM

Answer 17

Indicates a significant change in forecast conditions from this time (Jep 7.6)

Question 18

FM

Answer 18

If change reduces conditions a buffer is applied 30 minutes before time of change

Question 19

FM

Answer 19

• If change improves conditions a buffer is applied 30 minutes after time of change

Question 20

FM

Answer 20

• If arrival time is during the FM or buffer periods and the change reduces below alternate minima an alternate required

Question 21

Thunderstorms

Answer 21

• If thunderstorms forecast fuel for alternate required; or
• If endorsed with INTER or TEMPO sufficient holding fuel (30 or 60 minutes)
• Same buffer rules apply as per INTER & TEMPO