Uncoordinated Turn at 300 Feet
Carburetor ice, partial power loss, and an uncoordinated low-altitude turn in a Piper Warrior — the stall/spin trap
The scenario
Departing Peter O Knight Airport (KTPF), Tampa, FL — Runway 22, climbing out on a 217° heading over open water and medium development. Elevation 8 ft MSL; the runway is essentially at sea level.
It is a hazy Florida afternoon in late spring: OAT 29°C, dew point 23°C, altimeter 29.92. Scattered clouds at 2,500 ft, light rain shower two miles to the northeast. Visibility 8 SM. Classic Gulf Coast conditions — warm, moist, and exactly the environment the FAA icing probability chart marks as 'serious icing at glide power, moderate icing at cruise power.'
You are 300 ft AGL, climbing through 79 KIAS (Vy, best rate of climb), heading 217°, when the engine begins to run rough. Power is noticeably down — the tachometer is dropping. The water of Tampa Bay and Hillsborough Bay fill the windscreen ahead. KTPF is non-towered (CTAF); you are in Class G airspace, but the overlying Tampa Class B begins at 1,200 ft MSL.
Aircraft: Piper PA-28-161 Warrior, solo, full fuel, within limits. Carbureted Lycoming O-320-D, fixed-pitch prop, steam panel, fuel selector on LEFT (the active tank). Nothing was written up; the airplane was airworthy at departure.
Pilot: you — a Private pilot, current, roughly 200 hours total. You did not apply carburetor heat during the run-up because the engine ran smoothly. You did not apply it after takeoff because you were heads-down on the climb, focused on the heading and altitude.
- {'label': 'Field', 'value': 'KTPF · Peter O Knight'}
- {'label': 'Runways', 'value': '4/22 · 18/36'}
- {'label': 'Elevation', 'value': '8 ft'}
- {'label': 'Aircraft', 'value': 'PA-28-161'}
- {'label': 'Dominant phase', 'value': 'Landing / Approach'}
The decision
Before we get into the decision tree — what do you already know about carburetor ice and stall/spin risk in the Piper Warrior? (Pick all that apply; this records your baseline.)
What the record shows
What the NTSB files show
NTSB LAX03LA238 (2003): A Piper PA-28-161 encountered carburetor ice during initial climb from Torrance, California. The pilot did not apply carburetor heat. During a go-around attempt, the pilot failed to maintain adequate airspeed, resulting in a stall. The aircraft collided with power lines and terrain. The probable cause was carburetor icing and the pilot's failure to use carburetor heat and maintain airspeed.
NTSB CHI05LA226 (2005, FATAL): A Piper PA-28-161 on an instructional flight from Culver, Indiana, lost engine power due to left magneto failure during initial climb after takeoff. The flight instructor failed to maintain airspeed and follow emergency procedures. The aircraft stalled at low altitude. The probable cause was partial magneto failure caused by improper maintenance, with contributing factors including the instructor's failure to maintain sufficient airspeed to avoid a stall.
NTSB CEN12FA188 (2012, FATAL): A Piper PA-28-161 stalled during takeoff from a soft grass airstrip with a quartering tailwind and struck trees at the departure end of the runway. The probable cause was the pilot's failure to maintain airplane control during takeoff, which resulted in an aerodynamic stall. Contributing factors included inadequate preflight planning for soft-field conditions and failure to obtain a weather briefing.
The local environment at KTPF makes this scenario particularly unforgiving: Runway 22's departure end is open water — Tampa Bay and Hillsborough Bay. An engine failure on the Runway 22 departure at low altitude is a ditching, not a field landing. There is no open field, no road, no park. The water is the off-field environment. This is not hypothetical; it is the NLCD ground cover off that runway end.
The real accidents cited above occurred at other airports and in other aircraft types — NOT at Peter O Knight Airport. KTPF has its own accident history (see field dominant patterns: FORCED_LANDING 19.4%, LOSS_OF_CONTROL_INFLIGHT 16.7%, STALL_SPIN 8.3%), but these specific NTSB events happened elsewhere. The scenario is localized to KTPF to make the off-field environment real and consequential for you as a student here.
The consistent thread across all these events: carburetor ice in the PA-28-161 is insidious, and the response to partial power loss at low altitude is to maintain airspeed and avoid uncoordinated maneuvering. An uncoordinated turn or slip at 300 ft AGL with reduced power is a stall/spin trap. The Warrior's wing will stall if you slip or skid. The fix — full carburetor heat immediately, at the first sign of roughness, combined with maintaining best glide speed (73 KIAS) and coordinated flight — is simple. The failure is always a delay or an uncoordinated maneuver.
Key lesson — In warm, moist Gulf Coast air, the PA-28-161's carbureted O-320-D can accumulate serious carburetor ice even at cruise power and above-freezing temperatures. Apply full carburetor heat at the first sign of engine roughness or unexplained RPM loss. At low altitude over water, the decision window is measured in seconds — not minutes. Off Runway 22 at KTPF, the off-field environment is open water: a delayed response or an uncoordinated turn means a ditching or a stall/spin, not a field landing. Maintain best glide speed (73 KIAS) and coordinated flight in any low-altitude emergency.
Debrief — teaching points
Carburetor ice forms in conditions you would not expect.
The FAA icing probability chart shows 'serious icing at glide power' at temperatures between roughly 20°C and 30°C when relative humidity is high — exactly the Gulf Coast afternoon conditions at KTPF. You do not need visible ice, freezing temperatures, or IMC. Warm, moist air at reduced power is the classic carb-ice environment. The PA-28-161's Lycoming O-320-D is carbureted; it has no fuel injection or alternate air system. Carburetor heat is the only tool.
The first symptom is subtle — a dropping tachometer and engine roughness.
In a fixed-pitch airplane like the PA-28-161, carburetor ice first shows as engine roughness and an unexplained RPM decrease. There is no dramatic power cut. Pilots who are not actively monitoring the tachometer miss the early warning. By the time the roughness is obvious, significant ice has accumulated. Scan the tachometer as part of your regular instrument scan, especially in conducive conditions.
Apply full carburetor heat — not partial — and expect an initial RPM drop.
When you apply carb heat to an iced carburetor, the RPM will drop further before it rises. This is expected and normal: the heat is melting ice and the resulting water is briefly disrupting combustion. Do not remove carb heat when the RPM drops — that is the heat working. Hold it full on. The RPM will recover as the ice clears, typically within 15–30 seconds depending on ice accumulation. Partial carb heat can worsen the situation by partially melting ice into water ingestion without fully clearing the restriction.
At KTPF Runway 22, an engine failure on departure is a ditching.
The off-field environment off Runway 22's departure end (heading 217°) is open water — Tampa Bay and Hillsborough Bay. There is no alternate landing surface. If the engine quits on the Runway 22 departure and altitude is insufficient to return to the airport, the outcome is a ditching. This is not a worst-case scenario; it is the geographic reality. Best glide is 73 KIAS. Doors unlatched before water contact. Master off just before impact. Flaps for slowest possible touchdown speed — impact energy rises with the square of touchdown speed, so the slowest possible speed matters most. Know this before you line up on Runway 22.
An uncoordinated turn at low altitude with partial power is a stall/spin trap.
At 300 ft AGL with partial power, rough engine, and reduced airspeed margin, an uncoordinated turn or a slip can trigger a stall. The Warrior's wing will stall if you slip or skid, especially at low altitude with power off or reduced. The NTSB CHI05LA226 instructor failed to maintain airspeed during the climb; the NTSB LAX03LA238 pilot failed to maintain airspeed during the go-around. Both stalled at low altitude. In a low-altitude emergency, maintain best glide speed (73 KIAS) and keep the airplane coordinated. Do not slip or skid. A stall at 300 ft AGL is not recoverable.
Built from the real accident record
Scenario built from NTSB LAX03LA238 (2003 PA-28-161 carburetor ice / stall on go-around), CHI05LA226 (2005 PA-28-161 magneto failure / stall during climb), and CEN12FA188 (2012 PA-28-161 stall during takeoff from soft field). Localized to Peter O Knight Airport (KTPF), Tampa, FL.
NTSB reports: LAX03LA238 · CHI05LA226 · CEN12FA188
ACS tasks: PA.I.F — Weather Information · PA.I.G — Cross-Country Flight Planning · PA.II.A — Preflight Inspection · PA.II.B — Engine Starting / Systems Preflight · PA.III.A — Normal Takeoff and Climb · PA.III.C — Short-Field Takeoff and Climb · PA.IX.C — Emergency Approach and Landing · PA.I.H — Human Factors
Relevant FARs: §91.3 · §91.13 · §91.185
Step through the full decision tree, make the calls, and see where each choice leads — then debrief it with your CFI.
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