Constant-Airspeed Climbs & Descents
On instruments you frequently change altitude at a constant airspeed. You set a pitch and power for the desired airspeed, hold it with the scan, and lead the level-off so you roll out exactly on the new altitude and back at cruise airspeed.
Step by step
- 1Establish the climb or descent: adjust power and set the pitch on the attitude indicator for the target airspeed.
- 2Trim to hold the new attitude; verify the airspeed on the ASI and the trend on the VSI.
- 3Hold heading with bank control and keep the cross-check moving.
- 4Lead the level-off by about 10% of the vertical speed (e.g., 50–100 ft early for a 500–1,000 fpm rate).
- 5At level-off, smoothly adjust pitch to the level attitude and reset power for cruise/level airspeed.
- 6Re-trim and confirm altitude ±100 ft and airspeed back on target.
Tips & common errors
- Pitch sets the airspeed; power sets the rate — adjust both to hit the target speed and a reasonable rate.
- Lead the level-off (≈10% of the vertical speed) so you stop right on the assigned altitude.
- Common error: chasing airspeed with big pitch changes — use small, trimmed inputs.
- Re-trim at every attitude change so you can keep scanning instead of holding pressure.
ACS completion standards
The commonly-tested tolerances for this maneuver. Always confirm the current ACS for your certificate.
- Maintain the desired airspeed ±10 knots during the climb/descent.
- Maintain heading ±10° and level off at the desired altitude ±100 feet.
- Use a proper cross-check and trim technique.
FAA source
FAA-S-ACS-8 (Instrument Rating ACS), Task: Basic Instrument Flight (climbs/descents); Instrument Flying Handbook FAA-H-8083-15, Chapter 7.
This is an original, plain-English study summary grounded in the public-domain FAA Airman Certification Standards and FAA handbooks cited above. It is a study aid, not flight instruction, and not a substitute for the official ACS, the handbooks, your aircraft’s POH/AFM, or a certificated flight instructor.
Related maneuvers
- Attitude Instrument Flying & the Instrument ScanAttitude instrument flying is the foundation of all instrument flight: you control the airplane by interpreting the instruments instead of looking outside. You set an attitude on the attitude indicator (control), verify the result on the other instruments (performance), and trim. A disciplined cross-check (scan) prevents fixation and keeps every parameter in tolerance.
- Rate Climbs & Descents (Constant Vertical Speed)Sometimes you must hold a specific vertical speed (for example to meet a crossing restriction or to fly a constant descent rate on an approach). You adjust pitch and power to pin the VSI to a target rate while still controlling airspeed, then lead the level-off.
- Steep Turns (Instrument)On instruments, a steep turn (typically a sustained 45° bank) tests your cross-check and control as the higher bank increases the back-pressure and power needed to hold altitude. With no outside horizon, you must control everything by the attitude indicator and supporting instruments.
- Recovery from Unusual Flight AttitudesAn unusual attitude is an unintended extreme pitch and/or bank, usually from distraction, turbulence, or spatial disorientation. By interpreting the instruments (not your senses), you quickly determine whether you are nose-high (approaching a stall) or nose-low (overspeeding) and apply the correct, prioritized recovery.
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