DGCA Air Regulations: Aerodrome Control Service Questions

Correct answer: C. Aerodrome is unsafe, landing is prohibited

Flashing RED to an aircraft IN FLIGHT = AERODROME UNSAFE — DO NOT LAND. This is a critical light gun signal. Compare: Steady RED in flight = Give way, continue circling. Flashing GREEN in flight = Return for landing. The flashing red is a warning that something on the ground makes landing dangerous right now.

Correct answer: B. May continue to taxi towards the take-off area

A series of GREEN flashes to a taxiing aircraft means Authorised to taxi or Continue taxiing. Green = go! Flashing green to a taxiing aircraft is permission to proceed toward the runway. A steady green would mean cleared for takeoff if you are at the runway).

Correct answer: C. Move clear of the landing area

A red FLASHING light from the tower to an aircraft on the ground means Move clear of the landing area immediately. Red = danger/stop. Flashing = urgent action needed. If you are on the runway or taxiway and get a red flash — get out of the way fast, a landing aircraft is coming!

Correct answer: C. Raising one arm with fingers extended in front of the face and then closing the hand into a fist

To signal brakes applied, the pilot raises one arm with fingers spread open, then closes it into a fist. Open hand = brakes OFF, closed fist = brakes ON. Think of squeezing a brake lever — your hand closes into a fist just like that.

Correct answer: A. May continue to taxi towards the take-off area

Light signals from the tower are like traffic lights for aircraft when the radio fails. A flashing green light to an aircraft on the ground means — You are cleared to taxi toward the runway. Think green = go, just like a road traffic light!

Correct answer: C. Taxi immediately to runway and commence rolling take off

Cleared for immediate takeoff means there is no time to waste — you must roll onto the runway and start your takeoff roll right away without stopping. ATC says this when there is traffic coming in or departing soon. You do NOT stop at the runway for power checks first. You enter and go! If you are not ready, you must tell ATC.

Correct answer: A. Raise arm and hand, with fingers extended, horizontally in front of body, then clench fist.

Marshalling signals are like a special sign language between ground crew and pilots. To signal apply parking brakes, the marshaller raises one arm with fingers spread open — showing an open hand — and then closes it into a fist. Open hand = brakes released, closed fist = brakes applied. It is a very visual and clear signal that the pilot can easily see and understand from the cockpit.

Correct answer: A. A white double cross

Aerodrome ground signals are displayed in the signal square to tell pilots what is happening at the airport. A white double cross two white crosses side by side) means glider flying is being conducted at the aerodrome. This warns powered aircraft that gliders — which are silent and hard to see — are operating in the area and extra caution is needed. The C on yellow means a pilot reporting point, and the red/yellow square means special precautions.

Correct answer: B. Cut Engines

Marshalling signals are the ground crew's language to pilots. When the marshaller holds arms level with their chest horizontal) and then moves them laterally sweeping to the sides), this is the signal to CUT ENGINES — shut down the engines. Think of it as a horizontal slashing motion across the chest meaning cut or stop the engines. Different from the STOP signal which is arms raised straight up with palms forward.

Correct answer: C. 0.36 to 0.40

Medium to Good friction coefficient is approximately 0.36 to 0.40. Think of the scale like school grades: Poor = F below 0.25), Medium = C 0.26-0.35), Medium to Good = B 0.36-0.40), Good = A above 0.40). The higher the number, the better your tyres grip the runway.

Correct answer: B. Poor

A friction coefficient of 0.20 means POOR braking action. Think of it like trying to stop on an icy road — very slippery. The friction scale goes roughly: below 0.25 = Poor, 0.26-0.35 = Medium, 0.36-0.40 = Medium to Good, above 0.40 = Good. At 0.20 you can barely brake, so it is classified as Poor.

Correct answer: B. 2 minutes

When a MEDIUM aircraft takes off behind a HEAVY aircraft on the same runway, the minimum wake turbulence separation is 2 MINUTES. Heavy aircraft leave behind powerful spinning vortices of air like invisible tornadoes) behind their wingtips. A medium aircraft needs 2 minutes for those dangerous vortices to weaken before it is safe to take off.