Mach Number Technique

Question 1

Turbojet aircraft shall adhere to Mach number approved by ATC and shall request ATC approval before making changes. True or False?

Answer 1

True

Question 2

If it is essential to make an immediate temporary change in the Mach number, ATC shall be notified as soon as possible that such a change has been made.

Answer 2

True

Question 3

If it is not feasible, due to aircraft performance, to maintain the last assigned Mach number during en-route climbs and descents, pilots of aircraft concerned shall advise ATC at the time of climb/descent request

Answer 3

True

Question 4

What is a Mach number?

Answer 4

TAS expresses as a fraction of the local speed of sound.

Question 5

The colder the slower the Mach number. True or False?

Answer 5

True

Question 6

In ISA conditions, at sea level Mach 1 is a little over how many kts?

Answer 6

661kts TAS

Question 7

At FL360 the speed of Mach 1 decrease to?

Answer 7

572kts remains that figure around FL600-fl700

Question 8

A/c performance handling qualities and limitations are dependent upon and expressed in terms of IAS and Mach number

Answer 8

True

Question 9

When dealing with two aircraft at the same level, assigning the same Mach number will produce the same TAS. True of false?

Answer 9

True

Question 10

What levels are Mach numbers used?

Answer 10

FL250

Question 11

At higher levels, 0.01 Mach equals 6 knotsTAS. Mach 0.8 at FL290 will produce same TAS as Mach 0.83 at FL370

Answer 11

True

Question 12

The speed of sound is slightly less at FL370 than FL290. True or False?

Answer 12

True

Question 13

Longitudinal Separation minima Mach number technique based on
When the Mach number technique (MNT) is applied provided that?

Answer 13

1) A/C concerned have reported I’ve the same common point and follow the same track or continuously diverging tracks until some other form of separation is provided
2) A/C have not reported ice the same point and is possible to ensure, by Radar ADS-B or other means, that appropriate time interval will exist at the common point from which they either follow the same track or continuously diverge

Question 14

Between turbojet aircraft on the same track whether in level flight, climbing/descending flights shall be:

Answer 14

10 minutes or

Between 9-5 minutes provided that preceding a/c is maintaining a true Mach number greater than the following aircraft

Question 15

RNAV Distance-based Separation minima shall not be applied after ATC has received pilot advice indicating navigation equipment deteriorations failure

Answer 15

True

Question 16

A 80nm (150km) RNAV distance based separation minimum with Mach number technique may be used on same direction track in lieu of 10 minute longitudinal separation minimum with Mach number technique provided:

Answer 16

1) A/C reports it’s distance from same on track way point
2) Separation between a/c at the same level is checked by obtaining simultaneous RNAV distance readings from the a/c at frequent intervals to ensure that the minimum will not be infringed
3) Separation between a/c climbing or descending is established by obtaining simultaneous RNAV distance readings from the aircraft
4) A/C climbing/descending one a/c maintains a level while vertical separation does not exist

Question 17

When 80nm (150km) Separation longitudinally minima with MNT is allied the preceding aircraft shall:

Answer 17

Maintain a Mach number equal to or greater than the following a/c

Question 18

To facilitate application of the procedure where a considerable change of level is involved, a descending/climbing a/c may be cleared to some
Convenient level above or below the a/c. True or False?

Answer 18

True

Question 19

A/C in reciprocal tracks utilising RNAV May be cleared to?

Answer 19

Climb or descend to or trough the levels occupied by other a/c utilising RNAV provides it has been positively established by simultaneous RNAV distance readings to or from the same “on-track” waypoint that the a/c passed each other and are at least 80nm(150km)