AFH ch. 13 · ACS multiengine tasks
Multi-Engine Add-On Study Guide
A free multi-engine add-on study guide. The multiengine add-on has no ACS of its own — it's a practical test against the multiengine tasks of the certificate you already hold. This guide covers the knowledge that rating actually turns on: what Vmc really means, why one engine is critical, what one-engine-inoperative performance costs you, and the drills that decide whether an engine failure is an incident or an accident.
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Sections
ME.1
Why the Second Engine Changes Everything
Understand what the second engine actually buys you, why an engine failure in a light twin is a performance and control problem at the same time, and why the accident record for light twins turns on the pilot rather than the airplane.
ME.2
Vmc — Aerodynamics and the Certification Conditions
Explain what minimum control speed means, the conditions under which the published red-line Vmc was determined, and how each real-world departure from those conditions moves the actual Vmc up or down.
ME.3
The Critical Engine
Identify the critical engine and explain why P-factor and the resulting difference in moment arm make it critical, and why counter-rotating propellers remove the asymmetry.
ME.4
One-Engine-Inoperative Performance
Work the numbers that decide whether an engine failure is survivable: Vyse and Vxse, the single-engine climb gradient and service ceiling, the drag penalties, and accelerate-stop and accelerate-go distances.
ME.5
Propellers, Feathering, and Systems
Explain constant-speed and feathering propeller operation, the accumulator and unfeathering system, and the fuel and electrical system differences a twin adds, including crossfeed.
ME.6
Engine Failure Procedures
Fly the decision and the drill for each phase: failure before Vmc on the runway, failure after liftoff, and failure in cruise — including the identify, verify, feather sequence and zero-sideslip control.
ME.7
Single-Engine Approach and Landing
Plan and fly a visual approach and landing with one engine inoperative, including configuration timing and why a single-engine go-around is usually not available once committed to land.
ME.8
Weight, Balance, and Loading
Compute weight and balance for a light twin, including nacelle and baggage stations, and explain how loading affects Vmc, single-engine climb, and controllability.
ME.9
Regulations, the Rating, and the Checkride
Know how the multiengine class rating is added — no knowledge test, a practical test against the multiengine tasks of the ACS you hold — plus the currency, endorsement, and insurance realities that follow.