Common errors

Constant-airspeed instrument climb errors split into three families: primary-shift errors (treating altimeter as primary when ASI should be), level-off precision errors (late or early), and coordination errors (heading drift, scan breakdown during the climb). The six below cover the common faults.

1. Treating altimeter as primary for pitch in the climb

What it looks like: the pilot fixates on the altimeter, watching it tick upward, and adjusts pitch to maintain the climb rate. Airspeed drifts unnoticed because the ASI isn't being checked.

Why: the straight-and-level (VIII.A) habit of "altimeter is primary for pitch" hasn't been updated for the new flight phase.

Fix: ASI is primary for pitch in a constant-airspeed climb. Cycle through the scan with ASI as the most-checked primary. The altimeter is a trend instrument here, not the primary.

2. Late level-off (through the target)

What it looks like: the pilot waits for the altimeter to read the target altitude before starting the level-off. The airplane continues climbing past the target by 50–150 ft before the new straight-and-level attitude takes effect.

Why: reacting to the altimeter instead of anticipating with the 10% rule.

Fix: lead by 10% of the climb rate. At 700 fpm, start the level-off 70 ft below the target. The airplane will arrive at the target as the new straight-and-level condition stabilizes.

3. Early level-off (short of the target)

What it looks like: the pilot anticipates too aggressively and settles into straight-and-level 100–200 ft below the target. Now they have to climb the difference at low climb rate (cruise power, level pitch).

Why: over-correcting for the late-level-off bust (#2), or estimating the lead too generously.

Fix: measure the lead, don't guess. 10% of climb rate; if the climb rate is 700 fpm, lead is 70 ft, not 200. If the actual lead is too aggressive, the result is the early level-off — back off the lead next time.

4. Heading drift during the climb

What it looks like: the airplane climbs at the target airspeed but drifts 15–20° off heading by the time the level-off begins.

Why: left-turning tendencies are stronger in a climb (P-factor + torque at high power + high alpha). Without active right rudder, the airplane yaws left.

Fix: right rudder during the climb. Continuous pressure, sized to the current power and pitch attitude. The HI is the diagnostic — if heading drifts left, more right rudder.

5. Pitch-only adjustment to fix airspeed

What it looks like: ASI shows airspeed 5 KIAS slow. Pilot pitches down slightly. Airspeed recovers but the climb rate has decreased. Pilot pitches back up. Cycle repeats.

Why: treating airspeed correction as a pure pitch problem when it might be a trim problem.

Fix: after correcting pitch, trim. The airplane should be hands-off at the target airspeed. If you have to hold the elevator, you didn't trim — and the next scan will show the same drift.

6. Scan breakdown during the level-off

What it looks like: during the level-off transition, the pilot fixates on the altimeter to "watch the target." Meanwhile, airspeed builds past the cruise tolerance because power wasn't reduced in time.

Why: the level-off feels important enough to monopolize attention; the other parameters are forgotten.

Fix: pitch and power together at the level-off; trim; verify all primaries. The level-off is a quick transition (5–10 seconds); the scan continues throughout. Altimeter at target, ASI at cruise, HI on heading — all three.

How errors compound. The primary-shift error (#1) is upstream — it makes the climb harder to fly because the scan is wrong, which makes the level-off anticipation harder (#2 or #3), which makes the post-level-off cruise harder (#6). The discipline that prevents the chain: internalize the primary-supporting model from VIII.A and recognize when it shifts. The pattern recurs in descent (VIII.C) and turn (VIII.D) — each task has its own primary-supporting matrix.