Definition
The performance, limitation, and operational data published by the airplane manufacturer in the Pilot's Operating Handbook (POH) or Airplane Flight Manual (AFM) that the pilot relies on to operate the aircraft safely and within its certified envelope. In the context of angle of attack, this includes the published stall speeds, weight and balance limits, and configuration-specific airspeeds against which an AOA indicator's readings are interpreted.
Plain English
The information the airplane's maker provides in the pilot's handbook for that specific aircraft -- things like stall speeds, weight limits, and recommended airspeeds. It is the official reference for how that airplane is meant to be flown.
Context Anchor
In the Angle of Attack Indicators section, this means the pilot should use the airplane’s own handbook information to understand how that airplane’s angle of attack indicator is meant to be used.
Derivation
A handbook is a book kept close at hand for practical use. That fits the aviation meaning: this is not general background reading, but ready reference information the pilot uses to operate a particular airplane correctly.
Why Pilots Care
AOA indicators and similar instruments are useful only when their readings are checked against the airplane's actual published numbers. Pilot handbook information is the authoritative source for those numbers -- guesses or rules of thumb from another airplane do not substitute for it.
Intuition Check
Do not read this as any aviation book or general pilot advice. Here, it means the specific manual information that applies to the airplane and equipment being operated.
Example Sentence 1
Before relying on the AOA indicator, the pilot reviewed the pilot handbook information to confirm the published stall speeds for the current weight and flap setting.
Example Sentence 2
Student pilots are expected to review pilot handbook information on each new instrument before using it in flight.