Instrument Flight Rules (IFR) Chapter 3

Questions and Answers

What is the primary purpose of air traffic control clearances?

To expedite and separate air traffic, based on known traffic conditions

What should a pilot do if they receive a clearance or instruction that cannot be complied with?

Advise the controller using the phrase 'UNABLE' and provide a reason

What is the responsibility of the pilot-in-command regarding ATC clearances?

To ensure compliance with all applicable regulations

What is the purpose of Tehran ACC issuing ATC clearances?

To prevent collisions and maintain an orderly flow of air traffic Signup and view all the answers

What must ATC clearances be issued in time to allow for?

Aircraft to comply with the clearance Signup and view all the answers

What is the responsibility of Tehran ACC when clearance to enter Tehran FIR has not been issued due to any possible reason?

To take all possible measures for the clearance to be issued Signup and view all the answers

When a flight plan specifies that the initial portion of a flight will be uncontrolled, what should the ATS unit at departure aerodrome obtain before departure?

Clearance from the Tehran ACC sector Signup and view all the answers

What is the limit of clearance when a flight plan specifies that the first portion of a flight will be subject to ATC, and that the subsequent portion will be uncontrolled?

The controlled airspace boundary Signup and view all the answers

What phraseology is used when an aircraft intends to leave a control area for flight outside controlled airspace?

LEAVE CONTROLLED AIRSPACE VIA (significant point or route) Signup and view all the answers

What is the initial clearance limit when an aircraft files, at the departure aerodrome, flight plans for the various stages of flight through intermediate stops?

The first destination aerodrome Signup and view all the answers

Study Notes

Aircraft Instruments and Equipment

Aircraft shall be equipped with suitable instruments and navigation equipment appropriate to the route to be flown.

Clearances

Clearances are issued solely for expediting and separating air traffic, and are based on known traffic conditions affecting safety in aircraft operation.
If a pilot receives a clearance or instruction that cannot be complied with, they must advise the controller using the phrase "UNABLE" and the reason for inability.
The controller shall issue an alternative clearance or instruction if the initial clearance is not suitable.
ATC clearances do not constitute authority to violate any applicable regulations or relieve a pilot-in-command of any responsibility.
Tehran ACC shall issue clearances necessary to prevent collisions and maintain an orderly flow of air traffic.
Clearances must be issued early enough to ensure timely transmission to the aircraft.
Tehran ACC may request an adjacent ATC unit to clear aircraft to a specified point during a specified period.

Aircraft Subject to ATC for Part of Flight

If a flight plan specifies that the initial portion of a flight will be uncontrolled and subsequent portions will be subject to ATC, the ATS unit at departure aerodrome shall obtain clearance from Tehran ACC.
When a flight plan specifies that the first portion of a flight will be subject to ATC and subsequent portions will be uncontrolled, the aircraft shall be cleared to the destination aerodrome, with the limit of clearance being the controlled airspace boundary.
When an aircraft intends to leave a control area for flight outside controlled airspace and will subsequently re-enter the same or another control area, a clearance from point of departure to the aerodrome of first intended landing may be issued.

Flights Through Intermediate Stops

When an aircraft files flight plans for various stages of flight through intermediate stops, the initial clearance limit will be the first destination aerodrome, and new clearances shall be obtained for subsequent stages.