Common errors

Emergency descent errors split into three families: structural limit exceedances (the safety-critical failure mode), configuration mismatches (flap or gear extension at wrong airspeeds), and recovery errors (over-G or altitude bust at level-off). The six below cover the common faults.

1. Exceeding V_NE

What it looks like: the airspeed climbs past the red line during the descent. The ASI needle crosses into the prohibited range; some installations have a stall horn or overspeed alert.

Why: the misframing — "in an emergency, the limits are flexible." They aren't. The pilot has either not been watching the ASI, or has been watching and treated the limit as a guideline.

Fix: V_NE is absolute. If the airspeed is approaching the limit, shallow the bank immediately. The descent rate will reduce slightly; the airspeed will reduce more. Don't ride the limit; stay clearly below it.

2. Extending flaps above V_FE

What it looks like: the pilot extends flaps to add drag, but the airspeed at the moment of extension is above V_FE. The flaps experience structural overload — could damage or tear off in flight.

Why: "more drag" reasoning without checking the airspeed against the flap limit.

Fix: flaps only below V_FE. If the airplane is already above V_FE, flap extension is not available until airspeed reduces. Don't extend; manage descent with bank instead.

3. Negative-g entry

What it looks like: the pilot pushes the nose down aggressively to start the descent; the airplane experiences brief negative g. Fuel float in the carburetor may starve; oil system may have issues; pilot's seatbelt loads.

Why: treating "rapid descent" as "push the nose down hard."

Fix: the descent is a banked turn, not a pushover. Bank first, then pitch through the turn. The bank produces the descent; pitch is for attitude maintenance in the bank. Positive load factor throughout.

4. Configuration not matched to the airplane

What it looks like: the pilot enters the descent without setting prop full forward (in a controllable-prop airplane), or without throttle to idle. Descent rate is less than possible.

Why: rushed entry — pilot skipped configuration steps.

Fix: the configuration is the recipe. Throttle idle, prop full forward, gear/flaps per POH. Take 5 seconds to configure correctly; the resulting descent rate is much higher than a rushed configuration without setup.

5. Over-G on the recovery

What it looks like: the pilot pulls back aggressively at the level-off altitude. Load factor spikes to 2.5–3g; the airplane shudders; airspeed bleeds during the pull-out.

Why: wanting to limit altitude loss past the assigned altitude — the same misframing as the unusual-attitude recovery (VIII.E ERR #6).

Fix: smooth recovery. Roll wings level first (cross-ref VIII.E HOW), then pitch out gently. The airplane will climb back toward the target altitude even if you don't snatch back.

6. Level-off altitude bust

What it looks like: the airplane levels off well below the assigned altitude, or continues descending past it.

Why: reactive level-off without the 10% anticipation rule (cross-ref VIII.B PRI). At 3,000 fpm descent, waiting for the altimeter to read the target means continuing 300+ ft past it before the new straight-and-level takes effect.

Fix: lead by 10% of the descent rate. At 3,000 fpm, begin the level-off 300 ft above the target. Roll wings, smooth pitch up, add power; arrive at the assigned altitude as the cruise condition stabilizes.

How errors compound. Structural exceedance (#1 or #2) is the safety-critical failure mode the maneuver is built to prevent — and the one most likely under stress. The same psychology that makes a pilot rush the configuration (#4) makes them inattentive to the ASI (#1) and prone to aggressive recovery (#5). The discipline that prevents the chain: the limits are absolute, the configuration is deliberate, the recovery is smooth. Rehearse the sequence in the cockpit before flight so it's available under stress.