Low and Slow Over Tampa Bay
Partial power loss, uncoordinated turn, and the critical angle of attack — a stall/spin spiral at 400 ft AGL
The scenario
Departing Peter O Knight Airport (KTPF), Tampa, FL — Runway 04, climbing out on a 037° heading. Elevation 8 ft MSL; the runway is at sea level.
It is a hot, humid Florida summer morning: OAT 32°C (90°F), dew point 24°C, altimeter 29.89. Scattered clouds at 3,500 ft, visibility 10 SM. The density altitude is approximately 2,200 ft — the airplane will climb and accelerate as if it were at 2,200 ft elevation, not sea level. This is a high-density-altitude day. The Cessna 150M's 100 hp Continental O-200 is marginal on climb even at sea level; at density altitude 2,200 ft, climb performance is noticeably degraded.
You are a Private pilot, roughly 250 hours total, with about 40 hours in the C150M. You are conducting a local training flight — touch-and-go landings on Runway 04. Your instructor is in the right seat. The airplane is at gross weight (1,600 lb): you, your instructor, full fuel, and a small bag. The preflight was normal; nothing was written up.
You line up on Runway 04, advance the throttle to full power, and begin the takeoff roll. Flaps are set to 0° (you did not extend flaps for this short-field takeoff — the runway is 3,583 ft, plenty of length). Rotation speed (Vr) is approximately 50 KIAS; best angle of climb (Vx) is 60 KIAS; best rate of climb (Vy) is 68 KIAS.
You reach rotation speed, pitch up, and the airplane lifts off at 50 KIAS. You are climbing out over dense development off the Runway 04 end (heading 037°) — houses, roads, power lines, trees. The climb is noticeably shallow; the airplane is struggling to climb in the heat and high density altitude. You are at 200 ft AGL, airspeed 58 KIAS, and the engine begins to run rough. The tachometer is unwinding.
- {'label': 'Field', 'value': 'KTPF · Peter O Knight'}
- {'label': 'Runways', 'value': '4/22 · 18/36'}
- {'label': 'Elevation', 'value': '8 ft'}
- {'label': 'Aircraft', 'value': 'C150'}
- {'label': 'Dominant phase', 'value': 'Landing / Approach'}
The decision
Before we get into the decision tree — what do you already know about stall/spin risk in the C150M on takeoff and initial climb? (Pick all that apply; this records your baseline.)
What the record shows
What the NTSB files show
NTSB CEN23FA401 (2023, FATAL): A Cessna 150K on an instructional flight practicing touch-and-go landings experienced partial engine power loss due to fuel system blockage. The flight instructor failed to maintain adequate airspeed after the power loss, and the airplane stalled during a descending left turn at low altitude. The probable cause was fuel starvation caused by a fuel system blockage and the flight instructor's failure to maintain adequate airspeed after the loss of engine power, which resulted in the airplane exceeding its critical angle of attack and entering an aerodynamic stall at a low altitude.
NTSB WPR18FA244 (2018, FATAL): A Cessna 150 stalled during initial climb shortly after takeoff from Benton Field Airport when the pilot exceeded the critical angle of attack. The accident was attributed to the pilot exceeding the airplane's critical angle of attack during the initial climb after takeoff, with contributing factors including failure to properly configure wing flaps for takeoff and high density altitude. The pilot did not maintain adequate airspeed during the climb.
The local environment at KTPF makes this scenario particularly unforgiving: Runway 04's departure end is dense development — houses, roads, power lines. An engine failure on the Runway 04 departure at low altitude is a forced landing in residential terrain, not a field landing. There is no open field, no road, no park. The houses are the off-field environment. This is not hypothetical; it is the NLCD ground cover off that runway end. Runway 22's departure end is open water — Tampa Bay. An engine failure on the Runway 22 departure at low altitude is a ditching, not a field landing.
The real accidents cited above occurred at other airports and in other aircraft — 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%, DITCHING 11.1%, STALL_SPIN 8.3%), but these specific 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: a partial power loss at low altitude in a C150M is a stall/spin trap. The airplane is already marginal on climb in high density altitude. A power loss combined with an uncoordinated turn (skidding or slipping) or an attempt to maintain altitude with inadequate airspeed results in exceeding the critical angle of attack and entering an aerodynamic stall. The stall at 200 ft AGL over houses or water is unrecoverable. Early recognition of the power loss, immediate carb heat application, and a prompt return to the airport (or a turn toward the water if over development) is the entire lesson.
Key lesson — In high density altitude (2,200 ft DA on a 32°C day at sea level), the C150M's 100 hp Continental O-200 is marginal on climb even at full power. A partial power loss due to carburetor ice or fuel starvation at 200 ft AGL is a stall/spin trap. Off Runway 04 at KTPF, the off-field environment is dense development — a forced landing there is high-risk. Off Runway 22, the off-field environment is open water — a forced landing there is a ditching. Early recognition, immediate carb heat application, and a prompt return to the airport is the correct response. Do not attempt to maintain altitude with inadequate airspeed; do not turn steeply at low altitude with a sick engine. Fly the airplane — maintain airspeed, apply carb heat, and get back to the runway.
Debrief — teaching points
High density altitude degrades the C150M's already-marginal climb performance.
The C150M's 100 hp Continental O-200 is the defining constraint of this airplane. At sea level on a standard day, climb performance is modest. On a 32°C day at sea level, the density altitude is approximately 2,200 ft — the airplane climbs and accelerates as if it were at 2,200 ft elevation. Climb performance is noticeably degraded. A partial power loss in these conditions is a serious threat. The airplane may not be able to maintain altitude or climb. Know the density altitude before every flight; calculate it using the formula: DA ≈ field elevation + 120 × (OAT − ISA temperature). On a hot day, the C150M may not be able to climb out of a high-density-altitude field with a full load.
Carburetor ice forms in warm, moist air — not just in freezing temperatures.
The FAA icing probability chart shows serious carburetor icing risk at glide power in the temperature range of roughly 20–30°C with high relative humidity. Warm, moist air — not freezing temperatures — is the classic carb-ice environment. The temperature drop across the carburetor venturi can be 20–30°C, easily producing ice even when OAT is well above freezing. The C150M's Continental O-200 is carbureted; it has no alternate air system. Carburetor heat is the only tool. Apply full carb heat at the first sign of engine roughness or unexplained RPM loss in conducive conditions.
The C150M is stall-sensitive on turns, especially at low altitude with reduced power.
The light wing loading of the C150M makes it gust- and stall-sensitive on the base-to-final turn and on any turn at low altitude. The effective stall speed in a bank is higher than the clean stall speed of 47 KIAS. In a 20° bank, the effective stall speed rises to approximately 49 KIAS. In a 30° bank, it rises to approximately 54 KIAS. At 200 ft AGL with a sick engine and airspeed dropping, a steep turn is a stall/spin trap. Maintain airspeed above the clean stall speed (47 KIAS) and avoid steep banks at low altitude. If the engine fails on takeoff, do not attempt a steep turn back to the runway; instead, lower the nose to best glide speed (60 KIAS) and look for the best landing spot ahead.
At KTPF Runway 04, an engine failure on departure is a forced landing in dense development.
The off-field environment off Runway 04's departure end (heading 037°) is dense development — houses, roads, power lines. There is no alternate landing surface. If the engine fails on the Runway 04 departure and altitude is insufficient to return to the airport, the outcome is a forced landing in residential terrain. This is high-risk. At KTPF Runway 22, the off-field environment is open water — Tampa Bay. An engine failure on the Runway 22 departure at low altitude is a ditching. Know the off-field environment before you line up on any runway. If the engine fails on takeoff, turn toward the water (Runway 22 departure) if you are over development, or turn back toward the airport if you have enough altitude.
A partial power loss at low altitude is a stall/spin trap — do not attempt to maintain altitude with inadequate airspeed.
When the engine loses power at low altitude, the instinct is to pull back on the yoke to maintain altitude. This is wrong. Pulling back increases the angle of attack and risks exceeding the critical angle of attack, resulting in a stall. The correct response is to lower the nose to best glide speed (60 KIAS), apply carb heat, and look for a landing spot. At 200 ft AGL with a sick engine, you do not have the altitude to recover from a stall. Fly the airplane — maintain airspeed, apply carb heat, and get back to the runway or pick the best landing spot ahead.
Flaps should be retracted before attempting to climb away from the runway.
Extended flaps reduce climb performance and increase stall speed. In the C150M, the stall speed in landing configuration (flaps 40°) is 42 KIAS, compared to 47 KIAS clean. Flaps should be retracted as soon as the airplane is airborne and a safe altitude is established — typically by 300–400 ft AGL. If the engine fails shortly after takeoff with flaps extended, the airplane is even more marginal on climb and stall speed is higher. Retract flaps promptly after takeoff.
Built from the real accident record
Scenario built from NTSB CEN23FA401 (2023 C150K fuel starvation / stall on descending turn) and WPR18FA244 (2018 C150 stall during initial climb, flap misconfiguration, high density altitude). Localized to KTPF, Tampa, FL.
NTSB reports: CEN23FA401 · WPR18FA244
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 — Soft-Field Takeoff and Climb · PA.IV.A — Straight and Level Flight · PA.IV.C — Turns · PA.V.A — Slow Flight · PA.V.B — Stall Recognition and Recovery · PA.IX.C — Emergency Approach and Landing
Relevant FARs: §91.3 · §91.13 · §91.103 · §91.107
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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