ACS tolerances

The Private Pilot Airplane ACS (FAA-S-ACS-6C, effective May 31, 2024) anchors unusual-attitude tolerances around recognition from instruments, proper recovery sequence for each direction, and staying within structural and airspeed limits during the recovery.

The tolerances at a glance

Parameter	Target	Tolerance	Reference
Recognition	From instruments alone	Promptly	VIII.E.S1
Nose-high recovery	Correct sequence	Power → pitch → wings	VIII.E.S2
Nose-low recovery	Correct sequence	Power → wings → pitch	VIII.E.S3
Structural limits	Stay within G-load and V_NE	No exceedance	VIII.E.R2

Plus structural requirements:

• Recognize the unusual attitude solely by reference to instruments — VIII.E.S1
• Recover from a nose-high attitude with the proper sequence — VIII.E.S2
• Recover from a nose-low attitude with the proper sequence — VIII.E.S3

Recognition from instruments

VIII.E.S1 requires the pilot to identify the unusual attitude using the instruments, not their senses. The vestibular system after a 30–90-second blind-eyes entry is unreliable; the perceived attitude is often wrong.

The DPE evaluates by watching the pilot's first 3–5 seconds after the cue. A pilot who:

• Scans the panel methodically → recognizes correctly.
• Reacts to perceived motion → may apply the wrong sequence.

Recognition includes:

• Pitch (high or low).
• Bank (left, right, or wings level).
• Airspeed trend (increasing or decreasing).

Nose-high recovery sequence

VIII.E.S2: Power → pitch down → wings level → coordinated cruise.

The DPE evaluates each step. Missing the power reduction or pitching down without leveling wings (if banked) are bust markers.

Nose-low recovery sequence

VIII.E.S3: Power → wings level → pitch up → coordinated cruise.

The DPE evaluates each step with particular attention to step 2. Pulling out of the dive before leveling the wings is the central error this task is built to prevent — it's both a bust and a safety hazard (accelerated stall in the bank).

A pilot who applies the nose-high sequence to a nose-low attitude (pitching up while still banked) fails S3 even if the airplane survives the recovery.

Structural limits — V_NE and load factor

VIII.E.R2 names "excessive G-load or airspeed during recovery" as a risk. The corresponding tolerance: stay within V_NE and the airplane's load factor limits.

In a nose-low recovery:

• V_NE can be approached or exceeded as airspeed builds in the dive. Power reduction is step 1 to limit this.
• Load factor can be exceeded if the pull-up is aggressive at high airspeed. Smooth pull-out after wings are level is the protection.

In a nose-high recovery:

• Less likely to exceed structural limits because the airplane is decelerating.
• Stall avoidance is the dominant risk; power reduction + pitch down handle it.

What the maneuver does NOT require

• No fixed numerical altitude loss limit — the standard is "minimum altitude loss consistent with proper recovery," same as stall recovery (VII.B, VII.C).
• No specific recovery duration — the standard is correctness of the sequence and the final return to coordinated cruise.
• No pilot's senses — the standard explicitly requires recovery by reference to instruments.

The maneuver is graded on the sequence, not just the outcome. A pilot who recovers to level flight by accident — pulling up randomly until things stabilize — has not demonstrated the standard. The standard is correct sequence, applied to the correctly recognized attitude, with structural limits respected. The recovery is the demonstration of method, not just survival.