Reference Sheet

Commercial Pilot License (CPL) Reference Sheet

Interactive cheat sheet and formulas for the DGCA CPL certification. Filter concepts and download the print-friendly PDF guide for offline reference.

10 Reference Items Found

Air Navigation Formulas & Conversions

Wind Triangle / Drift (WCA)

Heading = Course +/- Wind Correction Angle (WCA)

Calculates the heading to steer to maintain the desired course, adjusting for crosswind drift.

Critical Point (CP)

Distance to CP = (D * H) / (O + H)

The point of equal time to continue or return, where D is total distance, H is Home-bound ground speed, and O is Out-bound ground speed.

Point of Safe Return (PSR)

Time to PSR = (E * H) / (O + H)

The furthest point from which an aircraft can return safely, where E is endurance in hours, H is home-bound ground speed, and O is out-bound ground speed.

Scale of a Chart

Scale = Chart Distance / Earth Distance

Determines chart scale (e.g. Representative Fraction 1:500,000) using distance ratios.

Aviation Meteorology Rules & Ratios

Temperature Lapse Rate

Standard Lapse Rate = 2 C per 1,000 ft (Dry Adiabatic: 3 C / Wet Adiabatic: 1.5 C)

The rate of temperature decrease with altitude. Used to calculate cloud bases and icing levels.

Altimeter Pressure Settings

QNH = MSL Pressure / QFE = Airfield Pressure / QNE = Standard (1013.25 hPa)

QNH reads airfield elevation on ground; QFE reads zero height on ground; QNE is standard pressure set for Flight Levels.

Air Regulations & Airspace Standards

VFR Visual Minimums (Class G)

Below 10,000 ft AMSL: 5 km visibility, 1,500 m horizontal & 1,000 ft vertical cloud clearance

Standard visual flight rules airspace limitations set by ICAO and DGCA for uncontrolled airspace.

Semi-Circular Cruising Levels

Track 000-179 (East): Odd Flight Levels / Track 180-359 (West): Even Flight Levels

Cruising altitude assignment standard to prevent mid-air head-on collisions.

Recommended DGCA Study Materials & References

Oxford Aviation Academy manuals

OAA Air Navigation & Meteorology textbooks

The premier preparation books covering EASA and DGCA CPL syllabi with detailed illustrations.

DGCA CARs (Civil Aviation Requirements)

Official CAR Series by Section (I to X)

The mandatory regulatory documents issued by DGCA India defining rules of the air, licensing, and safety limits.