Short-Field Takeoff and Maximum Performance Climb (ASEL, AMEL)

• Rotate and lift off at the recommended airspeed, accelerate to the recommended obstacle-clearance airspeed or VX, ±5 knots (CA.IV.E.S9)
• Hold that speed ±5 knots until the obstacle is cleared, or until 50 feet above the surface (CA.IV.E.S10)
• Then pitch for VY and accelerate to VY ±5 knots after the obstacle or at 50 feet AGL if the obstacle is simulated (CA.IV.E.S11)
• Maintain VY ±5 knots to a safe maneuvering altitude (CA.IV.E.S13)

Private allowed +10/−5 at every one of those points. There is no slack left for a fast VX climb.

Brakes: apply while setting engine power to achieve maximum performance (CA.IV.E.S7). Power: confirm takeoff power prior to brake release, and verify proper engine and flight instrument indications prior to rotation (CA.IV.E.S8).

Worth knowing the nuance behind the technique: the AFH notes some pilots hold the brakes until maximum obtainable rpm is achieved, but it has not been established that this results in a shorter takeoff run in all light single-engine airplanes (AFH ch. 6). What it does reliably buy is confirmation that the engine is making full power while stopping is still an option. Fly it the way the ACS words it and the way your POH words it.

Align on the centerline utilizing the maximum available takeoff area — the takeoff is started from the very beginning of the takeoff area (AFH ch. 6). Back-taxi if that is what it takes. Runway behind you is unusable, and the performance chart you just ran assumed you would use all of it.

Low-drag and neutral. The airplane rolls with its full weight on the main wheels and accelerates to liftoff speed; you adjust pitch and angle of attack to attain minimum drag and maximum acceleration, which in a nosewheel airplane means very little elevator input (AFH ch. 6). This is the exact opposite of the soft-field roll.

A premature liftoff or too-steep climb may cause the airplane to settle back onto the runway or contact obstacles. Even if it stays airborne, until you reach VX the initial climb stays flat, which is precisely the performance you needed the maneuver for (AFH ch. 6). Early rotation adds drag before it adds climb.

Let it. In airplanes with a natural tendency to lift off well before VX (AFH ch. 6):

1. Allow the airplane to lift off in ground effect
2. Reduce pitch to level
3. Hold it there, wheels just clear of the runway, until it accelerates to VX

That is preferable to forcing it to stay on the ground with forward elevator, which:

• Puts excessive pressure on the nosewheel
• Risks wheelbarrowing
• Hinders acceleration and overall performance

Gear and flaps stay in the takeoff position until the airplane is clear of obstacles (or as the manufacturer recommends) and VY has been established — and the ACS adds: after a positive rate of climb has been verified (CA.IV.E.S12). Until the obstacles are behind you, keep your focus outside; do not reach for the gear or flap handle or look inside for any reason (AFH ch. 6). Raise flaps in increments to avoid a sudden loss of lift and settling, then set normal climb power.

It changes the numbers you are flying to, not the technique. High density altitude (AFH ch. 6):

• Reduces engine and propeller performance
• Increases the takeoff roll
• Decreases climb performance

A maximum-performance takeoff is by definition a maneuver flown at the edge of the chart, so run it at the actual density altitude, weight, wind, and surface. Under marginal conditions, many airplanes simply cannot safely take off at maximum gross weight at certain altitudes and temperatures (AFH ch. 6); recognizing that on the ground is the risk-management answer the examiner wants.

• Failure to review the AFM/POH and performance charts before takeoff
• Failure to use all available runway/takeoff area
• Failure to have the airplane properly trimmed before takeoff
• Premature liftoff resulting in high drag; or holding it on the ground with excessive forward elevator
• Inadequate rotation resulting in excessive speed after liftoff
• Inability to attain or maintain VX; fixation on the airspeed indicator during the initial climb
• Premature retraction of gear or flaps (AFH ch. 6)

Because two ±5 knot windows meet at 50 feet. Below the obstacle you are holding VX ±5; at 50 feet AGL you lower the nose and are then graded on VY ±5 (CA.IV.E.S10, S11). In most trainers those speeds differ by only a handful of knots, so a sloppy pitch change flies straight out of one tolerance without ever settling into the other.

Fly it as a small, deliberate attitude change and hold it — and remember the AFH warning that in some airplanes a 5-knot deviation from the recommended climb speed produces a significant reduction in climb performance (AFH ch. 6). The tolerance is the physics, not the paperwork.

Identify a point along the runway at which the airplane should be airborne; reach it not flying, and the takeoff is discontinued — reduce power to idle, apply maximum braking, and maintain directional control (AFH ch. 6).

The planning number: POH ground-roll takeoff distance plus landing ground-roll distance, added together, is a good estimate of the total runway needed to accelerate and then stop. On a short field that sum is frequently longer than the runway, which is the real answer to the risk element — on some runways there is no accelerate-stop option at all, and you need to know that before you release the brakes rather than discover it at the far end.

This is the worst version of the engine-failure problem, because VX is a high-angle, low-speed climb: the airplane is already near the stalling angle of attack, you are holding substantial right rudder, and there is an obstacle in front of you.

1. Lower the nose immediately and aggressively — from a VX attitude the pitch change required is larger than from a normal climb — and coordinate with rudder as the P-factor disappears.
2. Establish the glide and land as nearly straight ahead as possible, accepting the obstacle. Do not attempt a turn back to the runway unless you have specifically trained for the emergency turn-back and have sufficient altitude (AFH ch. 6).
3. Flying into obstacles under control at the lowest survivable speed beats stalling short of them.

The risk-management answer is on the ground, though: a short field surrounded by obstacles may have no survivable off-airport option, and knowing that before you release the brakes is what changes the go/no-go.

Because everything the maneuver requires is also everything a stall/spin needs (CA.IV.E.R5 — stall, spin, or CFIT):

• High angle of attack — VX is flown close to the stalling angle, and the stall warning may be intermittent
• Low airspeed with maximum power — the maximum left-turning-tendency condition, so an uncoordinated correction is one rudder input away
• Low altitude — there is no recovery altitude available; a wing drop near the ground is not survivable
• Obstacles — the temptation to stretch the climb by raising the nose above VX, which reduces the climb gradient and takes you closer to the stall at the same time

The defense is discipline about the number: hold VX ±5 knots and let the obstacle clearance be whatever the airplane can produce. If the chart says the airplane will not clear it, the maneuver was the wrong decision, not a technique problem.