CX Ops A Minimum Flight Alt

Question 1

What obstacle clearance is provided on the en-route diversion guide for MRA/Grid MORA?

Answer 1

• 2500ft for altitudes below 5000ft
• 3000ft for altitudes between 5-8000ft
• 3500ft for altitudes above 8000ft.

Question 2

When does an increment for wind have to be added to Jepp chart grid MORA?

Answer 2

• When within 10nm (on airway), 20nm (off airway) of terrain which is
• 2000ft or more in elevation.

Question 3

How much obstacle clearance is provided on the MSA on a instrument approach chart?

Answer 3

1000ft for obstacles within 25nm.

Question 4

What wind factor is included in the MRA/Grid MORA calculation on the en-route diversion guides?

Answer 4

Up to 50kts of wind are included.

Question 5

How many feet need to be added to the MRAs if winds are stronger than 30kts?

Answer 5

500ft for winds between 31-50kts
1000ft for winds between 51-70kts
1500ft for winds above 70kts

Question 6

Up to how many knots of wind are included in the calculation of MRAs?

Answer 6

30kts

Question 7

What is the altitude clearance provided by grid MORAs on nav charts?

Answer 7

1000ft for altitudes below 5000ft

2000ft for altitudes above 5000ft

Question 8

How much altitude needs to be added to the Jepp Grid MORA to account for wind?

Answer 8

For terrain between 2-8000ft:

• 500ft for winds up to 30kts
• 1000ft for winds between 31-50kts
• 1500ft for winds between 51-70kts
• 2000ft for winds above 70kts

For terrain above 8000ft:

• 1000ft for winds up to 30kts
• 1500ft for winds between 31-50kts
• 2000ft for winds between 51-70kts
• 2500ft for winds above 70kts

Question 9

On airways, separation must be maintained from obstacles and terrain within ……..nm either side of track and …….nm beyond reporting or checkpoints.

Answer 9

10nm

Question 10

How much needs to be added to the MRA/Grid MORA on the en-route diversion guide if the wind is greater than 50kts?

Answer 10

500ft for winds between 51-70kts

1000ft for winds above 70kts.

Question 11

Off airways, separation must be maintained from obstacles and terrain within …….nm of track.

Answer 11

20nm

Question 12

What is the altitude clearance provided by MRAs?

Answer 12

1000ft on top of the grid MORA.
Therefore:
- 2000ft for altitudes below 5000ft
- 3000ft for altitudes above 5000ft

Question 13

When can an aircraft descend below LSALT, MSA, MRA,…?

Answer 13

• Radar vector not below MVA
• During take-off
• flying a published IAP or hold
• following company EO SID
• visual approach
• diverting according to en-route diversion guide

Question 14

How long is oxygen supplied for to the cabin by the oxygen system?
(A350/330)

Answer 14

A minimum of 45min (A350)

A minimum of 22min (A330)

Question 15

How long does the PBE
provide protection for?
(A350/330)

Answer 15

20min/15min

Question 16

How is grid MORA calculated?

Answer 16

Provides clearance from terrain for 1° of LAT/LONG

0-5000ft by 1000ft
+5000ft by 2000ft

No wind correction included

Question 17

What is MRA
How is is calculated
Terrain clearance?

Answer 17

• MRA is CX figure used on CFP
• uses highest grid MORA 10nm from track
• increased by 1000ft
• includes wind up to 30kt

-total clearance;
0-5000ft - 2,000ft
+5000ft - 3,000ft