Aviation and Flight Principles

According to DGCA Civil Aviation Requirements (CAR), a candidate must have completed 200 hours of flight time to be eligible for a Commercial Pilot License (CPL). This includes specific breakdowns of solo flying, cross-country flights, and instrument time. Options B, C, and D represent higher requirements that don't match the current CPL standards.

When the static source gets blocked, the altimeter freezes at the altitude where the blockage occurred because it cannot sense pressure changes. Since the aircraft continues straight and level at the same altitude, the altimeter will correctly indicate 2300 feet (the altitude at the moment of blockage). The static port is essential for the altimeter to function.

When the static source is blocked, the VSI cannot sense pressure changes in the static port. The VSI requires a pressure differential between the static port and its calibrated leak to indicate vertical speed. With a blocked static source, this differential cannot be established, so the VSI remains at zero regardless of actual descent rate. This is a critical instrument failure to recognize.

Standard pressure (QNE) is 1013.25 hPa. The field pressure is 1015.15 hPa, which is 2 hPa higher. Since 1 hPa ≈ 30 feet at sea level, 2 hPa × 30 feet/hPa = 60 feet. The field is at higher pressure than standard, so it's like being below the standard pressure datum. Therefore, the altimeter will read approximately -57 feet (negative, indicating below the standard pressure level of 0 feet). This is a pressure altitude calculation.

When the static source fails, breaking the glass of the VSI (Vertical Speed Indicator) provides an alternate static source because the VSI case is connected to the static system. This is a standard emergency procedure in many aircraft. The other options are irrelevant - turning off the battery, restarting magnetos, or squawking 7600 (radio failure code) do not address static system failure.

The attitude indicator (artificial horizon) operates on gyroscopic principles. A gyro rotor spins at high speed, maintaining its orientation in space due to angular momentum (rigidity in space). The instrument displays the aircraft's attitude relative to this gyro-stabilized reference. It does not use pressure, gravity, or radio waves - those are used by altimeter, turn coordinator, and VOR respectively.

Subsonic speed is defined as speed below Mach 1.0 (the speed of sound). Mach 1.0 is exactly the speed of sound (transonic region). Mach numbers greater than 1.0 (1.1, 1.2, etc.) are supersonic speeds. Only Mach 0.9 is below Mach 1.0, making it the only subsonic option. The question tests the definition of subsonic versus supersonic flight regimes.

In a slip, the aircraft is banked too steeply for the rate of turn, causing centrifugal force to be insufficient to balance gravity. The ball in the turn coordinator shows this协调状态 by rolling inside the turn (toward the low wing). In a skid (opposite condition), the ball rolls outside the turn. A centered ball indicates a coordinated turn. The ball direction indicates which way the pilot needs to correct.

A Machmeter measures the Mach number, which is the ratio of an aircraft's true airspeed to the local speed of sound at that altitude. As altitude increases, temperature decreases and the local speed of sound decreases, so the same true airspeed yields a higher Mach number. The instrument helps pilots avoid exceeding critical Mach numbers where control problems begin.

The Vertical Speed Indicator (VSI) measures and displays the rate of climb or descent in feet per minute. It works by detecting pressure changes in a calibrated chamber as the aircraft altitude changes. A climb shows a positive indication, while descent shows negative. The instrument has a lag due to its design but provides crucial trend information.

In a skidding turn, the aircraft has insufficient bank angle for the rate of turn, causing the nose to yaw toward the outside of the turn. This imbalance causes centrifugal force to exceed the horizontal lift component, and the ball rolls to the outside of the turn. Skidding turns are dangerous because they can lead to spins if a stall occurs.

QFE is the altimeter setting that causes the altimeter to read zero when the aircraft is on the ground at the reference airport. This setting is commonly used for circuit training and precision approaches where height above the airfield is the critical reference. QNH shows altitude above mean sea level, and QNE is the standard altimeter setting of 1013.25 hPa used at higher altitudes.

When an aircraft crosses from your left (port side) to right (starboard side) at a right angle, you are viewing its starboard side. Aircraft navigation lights are red on the port (left) wing and green on the starboard (right) wing, with white at the tail. Therefore, you see the green light on the starboard wing as it crosses from left to right. You would not see red (port side) or white (tail-only visible from behind) in this crossing scenario.

QNE is the term for the standard altimeter setting of 1013.25 hectopascals (hPa), also known as 29.92 inches of mercury (inHg). This is the International Standard Atmosphere (ISA) sea level pressure setting used for flight levels (above transition altitude). QNH is the local altimeter setting for height above mean sea level at a specific location, while QFE is setting for height above airport elevation. QNE specifically refers to 1013.25 hPa.