Enroute Procedures

Question 1

When flying IFR, what altitude should you fly if you lose communications?

Answer 1

Fly the higher of the minimum altitude prescribed for IFR, expected altitude, or last assigned altitude by ATC.

Question 2

What is the order of route selection for IFR when communications are lost?

Answer 2

Assigned route, vectored route, expected route, filed route.

Question 3

What should you do if your clearance limit is a fix from which an approach begins and you lose communications?

Answer 3

Begin descent and approach as close as possible to the estimated arrival time.

Question 4

What should you do if your clearance limit is not a fix on an approach and you lose communications?

Answer 4

Leave the limit at the expected time and proceed to a fix where an approach begins.

Question 5

What should you do if you lose communications while in VFR conditions?

Answer 5

Continue under VFR and land as soon as practicable.

Question 6

When must you report vacating an assigned altitude under IFR?

Answer 6

When vacating any previously assigned altitude or flight level.

Question 7

What are the mandatory IFR reporting points as per 14 CFR 91.183?

Answer 7

Un-forecast weather conditions, time and altitude passing a compulsory reporting point (if not under radar control), and any information relating to safety of flight.

Question 8

What are the position reporting elements in non-radar environments?

Answer 8

Aircraft identification, position, time, altitude or flight level, ETA and name of next reporting point and succeeding one, pertinent remarks.

Question 9

What is a cruise clearance in IFR?

Answer 9

A term used by ATC to assign a block of airspace from the minimum IFR altitude to the assigned cruise altitude, allowing climbing, descending, and leveling off at any intermediate altitude within the block.

Question 10

What is the requirement for DME above FL240?

Answer 10

DME or IFR-approved GPS is required above FL240.

Question 11

What is the squawk code for a hijacked aircraft?

Answer 11

7500

Question 12

What is the squawk code for lost communications?

Answer 12

7600

Question 13

What is the squawk code for an emergency?

Answer 13

7700

Question 14

Under what conditions can a pilot cancel IFR in flight?

Answer 14

A pilot may cancel IFR in flight anytime if not in IMC or in Class A airspace.

Question 15

What happens if an IFR flight plan is not canceled after landing at a nontowered field?

Answer 15

Failure to cancel IFR will trigger search and rescue operations.

Question 16

What altitude should the flight crew use supplemental oxygen after 30 minutes?

Answer 16

Flight crew should use supplemental oxygen at 12,500 MSL after 30 minutes.

Question 17

Where is Mode C transponder required?

Answer 17

Class A, B, and C airspace; above Class C airspace; within 30 NM of primary airport in Class B airspace (Mode C veil); above 10,000 MSL; within some Special Flight Rules Areas.

Question 18

Where is ADS-B Out required?

Answer 18

Anywhere Mode C is required, excluding Class E above 10,000 MSL and below 2,500 AGL, and Class E over Gulf of Mexico above 3,000 MSL within 12 NM of the US Coast.