Ghost Aviator · DGCA CPL & ATPL
The guardian aviator over night-lit India
Human Performance
& Limitations
Aviation Physiology · Aviation Psychology · Human Factors — a complete guide for the DGCA CPL & ATPL examinations.
Capt. Pankaj PahilPilot · Flight Instructor · Ground Instructor
Copyright & Edition

© 2026 Capt. Pankaj Pahil · Ghost Aviator. All rights reserved.

First edition, 2026. Published free of charge in service of student pilots at ghostaviator.com. This work may not be reproduced, redistributed, or sold without the written permission of the author.

Disclaimer: This book is a study aid for the DGCA Human Performance & Limitations examination. Every figure is compiled to be exam-accurate, but syllabi and regulations change — always confirm current values against the latest DGCA CARs and AICs. Nothing herein overrides an official publication, a medical examiner, or a flight manual.

Foreword

Of all the subjects a pilot must master, this is the only one about you. Navigation teaches the earth; meteorology teaches the sky; technical general teaches the machine. Human Performance teaches the one component that flies them all — and the one that most often fails.

In seventeen years of flying and instructing I have watched good pilots undone not by weather or metal, but by an ache in a sinus, a drink the night before, a light stared at too long in the dark, a slow bank that felt like level. None of it was mysterious. All of it was in a textbook. The gap between knowing a limit and respecting it at altitude is where this subject lives — and where accidents are quietly prevented, one informed decision at a time.

I wrote these notes for my own students, and I have gathered them here for every student pilot in India who cannot afford an expensive course but deserves a correct one. Learn the numbers until they are reflex. Understand the mechanisms until they are obvious. And then carry them into the cockpit, where the only exam that matters is the one you pass every time you land safely.

— Capt. Pankaj Pahil

How to Use This Book

The book is built in eleven modules and twenty-six chapters, running from the air outside the aircraft to the mind inside the pilot. Every chapter follows the same rhythm, and the furniture is always the same:

The furniture of every chapter
You will see…It means…
Blue boxA core definition or principle to anchor on.
Amber boxAn exam tip or mnemonic — the thing the examiner actually asks.
Red boxA danger, a killer item, or a number to memorise exactly.
Green boxA standard operating procedure — what a professional does.
Cinematic plateA full diagram — anatomy, cockpit or process — to make the mechanism unforgettable.
Mnemonic pillA memory aid; collected together in Chapter 25.
An eight-week plan

Table of Contents

Module 0 · The Threshold
1  The Human Factor
Module A · The Ocean of Air
2  The Atmosphere
3  Altitude & Oxygen
Module B · The Living Machine
4  The Brain & Nervous System
5  Breath & Blood
Module C · The Thin Air
6  Hypoxia
7  The Silent Killers
8  Pressure, TUC & Decompression
Module D · Poisons & The Cabin
9  Smoking & Alcohol
10  The Cabin Environment
Module E · The Senses
11  The Eye
12  The Limits of Sight
13  The Ear & Balance
Module F · The Deceived Pilot
14  Illusions & Spatial Disorientation
15  The Forces
Module G · The Fit Aviator
16  Fitness & Nutrition
17  Fitness to Fly
18  Drugs & Self-Medication
Module H · The Mind Aloft
19  Information Processing
20  Memory, Perception & Attention
21  Skills, Reaction & Learning
22  Judgment, Automation & the Cockpit
Module I · Rhythms & Resilience
23  Stress, Fatigue & Arousal
24  Body Clock, Sleep & Mental Health
Module J · The Exam Arsenal
25  Numbers & Mnemonics
26  Mock Test Papers
Capt. Pankaj Pahil