Minimum Altitude Requirements

Question 1

Clearance from terrain or obstacles up to 5000ft AMSL:

Answer 1

1000ft.

Question 2

Clearance from obstacles or terrain higher than 5000ft:

Answer 2

2000ft.

Question 3

Track defined by 2 separate Navaids, separation must be maintained from obstacles and terrain within:

Answer 3

10nm beyond reporting or checkpoints.

Elsewhere, within 20nm either side of track and 20nm beyond reporting or checkpoints.

Question 4

Extraction of safe altitude from en route and approach charts:

Answer 4

• On published route or track:MOCA
• When only MEA is published for a track it may be used.
• Off route, Grid MORA may be used.
• If using MOCA, MEA, MORA then ensure the aircraft is in the correct place for the altitude being used.
• Minimum altitudes on a STAR chart may be used.
• 25nm sector MSA
• NAV ACCUR HIGH or Navaid which it is based is tuned, identified and continuous reception maintained.
• PIC satisfied within 25nm of aid.
• RNAV approach, within 25nm of MSA ref point.

Question 5

Lower separation standards are allowed when:

Answer 5

• Under IFR with positive radar control.
• IFR but in VMC and at least 1000ft on top or in sight of the surface.
• VFR.

Question 6

Engine failure on takeoff.

Crew must be conversant with:

Answer 6

The engine failure procedure to clear obstructions.

Ensure ATC clearance complies within terrain requirements.

Question 7

Mountain waves cause pressure altimeter errors.

To compensate for the wind effect:

Answer 7

Within 20nm of terrain having an elevation exceeding 2000ft, the safe altitude needs to be increased by the amount specified in the table in OMA 8.1.

Question 8

An in flight clearance of at least 5000ft is necessary above:

Answer 8

Mountains which are up to 5000ft in height above the surrounding terrain.

For higher mountains, clearance should be at least equal to their height above terrain.

Question 9

Minimum altitude corrections.

Temperature correction.

When are corrections to MSA made?

Answer 9

• When the ambient surface temperature is lower than ISA-15 degrees C.
• MSA is the lowest safe altitude for the flight.
• Table OMA 8.1.

Question 10

Corrections to altitudes below MSA.

When under radar control, ATC should:

Answer 10

Apply the cold weather corrections.

If cleared to an altitude which is unacceptable, request a higher one

Question 11

Correct DA(H), MDA(H), IF/IAF/FAF alts, MAP, circling minima, check alts etc as per:

Answer 11

The altitude in table OMA 8.1.

Question 12

Use of managed FINAL APP mode is prohibited when:

Answer 12

Cold weather corrections are applied. Use a selected vertical mode.

Question 13

RNAV approaches. If above the chart temperature limit:

Answer 13

Managed FINAL APP if LNAV/VNAV DA. If a selected vertical mode is being used, only to LNAV MDA.

Question 14

RNAV Approaches. If temperature is below the chart temperature limit:

Answer 14

May only be flown in a selected vertical mode to LNAV minima.