Marginal Climb, Uncoordinated Turn
A Cessna 150M at gross weight, high density altitude, and a base-to-final turn that goes wrong — stall/spin risk at 300 ft AGL
The scenario
Departing Clearwater Air Park (KCLW), Clearwater, FL — Runway 16, a touch-and-go landing practice session. Elevation 71 ft MSL. It is a hot, humid July afternoon: OAT 34°C, dew point 26°C, altimeter 29.89. Density altitude is approximately 2,800 ft — the airplane will perform as if it were at 2,800 ft elevation, not sea level. Winds are light and variable, 3–5 kt. Visibility 10 SM. A typical Florida summer day.
Aircraft: Cessna 150M, two occupants (pilot and instructor), full fuel (38 gallons usable), at or very near gross weight (1,600 lb). The Continental O-200-A is a 100 hp carbureted engine — the defining trait of the C150 is marginal climb performance, especially at gross weight in high density altitude. The airplane was airworthy at preflight; nothing was written up. Flaps are set to 0° for takeoff.
You are a Private pilot, roughly 80 hours total, on a supervised dual flight with your CFI. You have completed three touch-and-go landings on Runway 34 (the reciprocal). On the fourth landing, you are on short final to Runway 16 (the opposite direction, into the wind). You are at 300 ft AGL, descending at 60 KIAS (Vref, approach speed with flaps down), and the runway is made. The CFI is monitoring.
Runway 16's climb-out environment (heading 155°) is poor: dense development, low-density development, medium development. There is no open field, no park, no water. If the engine fails on the Runway 16 departure, a forced landing in that development is the outcome. Runway 34's climb-out environment (heading 335°) is slightly better but still poor: low-density development, medium development, and scattered open developed areas (parks, large lots). The field is surrounded; there is no good off-field option.
You are in the landing phase. The runway is ahead. The CFI is quiet, letting you fly the approach. You are focused on the landing.
- {'label': 'Field', 'value': 'KCLW · Clearwater Air Park'}
- {'label': 'Runways', 'value': '16/34'}
- {'label': 'Elevation', 'value': '71 ft'}
- {'label': 'Aircraft', 'value': 'C150'}
- {'label': 'Dominant phase', 'value': 'Landing / Approach'}
The decision
Before we begin — what do you know about the Cessna 150M's stall/spin risk on the base-to-final turn? (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 exceeded its critical angle of attack and entered an aerodynamic stall at low altitude. The accident was fatal.
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. Contributing factors included failure to properly configure wing flaps for takeoff and high density altitude. The accident was fatal.
Both accidents share a common mechanism: a stall at low altitude (during approach or initial climb) with insufficient altitude to recover. In CEN23FA401, the power loss on approach (likely carburetor ice or fuel system blockage) was not diagnosed quickly, the airspeed was allowed to drop, and the stall occurred at 300–400 ft AGL. In WPR18FA244, the pilot attempted to climb too steeply after takeoff in high density altitude, exceeded the critical angle of attack, and stalled at low altitude.
The Cessna 150's defining characteristic is its light wing loading and marginal climb performance, especially at gross weight in high density altitude. The airplane is gust-sensitive and prone to stall/spin on the base-to-final turn, especially in uncoordinated flight. The critical angle of attack is the same regardless of airspeed — roughly 16–17° — but at low airspeed (near stall), the margin to that angle is zero.
Clearwater Air Park (KCLW) is surrounded by dense development. Off Runway 16's climb-out (heading 155°), the off-field environment is dense development, low-density development, and medium development — no open field, no park, no water. A stall/spin at 300 ft AGL off that runway end is a fatal accident into developed terrain. The same is true off Runway 34's climb-out (heading 335°): low-density development, medium development, and scattered open developed areas. There is no good off-field option at KCLW.
The real accidents cited above (CEN23FA401 and WPR18FA244) occurred at other airports — NOT at Clearwater Air Park. This scenario is localized to KCLW to make the off-field environment real and consequential for you as a student here. The accident pattern at KCLW itself (from the field's own corpus) shows FORCED_LANDING (22.2%), LOSS_OF_CONTROL_INFLIGHT (18.5%), and GEAR_UP_LANDING (18.5%) as dominant — the stall/spin risk is real.
The consistent thread across all these events: the C150 at gross weight in high density altitude is marginal on climb. A power loss on approach, an uncoordinated turn, or an attempt to climb too steeply can exceed the critical angle of attack. The margin to stall is zero at low altitude. The lesson is not to avoid the C150 — it is to respect its limits and never allow the airspeed to decay below the safe margin in critical phases of flight.
Key lesson — In the Cessna 150M at gross weight in high density altitude, the margin to stall is thin. On approach, maintain Vref (60 KIAS) or above. If the engine loses power, apply carburetor heat immediately and diagnose quickly. If you must go around, do so with full power and a shallow climb angle — do not attempt a steep climb. At low altitude, airspeed is your life. Never allow the airspeed to decay below the safe margin. Off Runway 16 at KCLW, the off-field environment is dense development — a stall/spin at 300 ft AGL is a fatal accident.
Debrief — teaching points
The C150 at gross weight in high density altitude is marginal on climb.
The Continental O-200-A produces 100 hp — the defining trait of the C150 is marginal climb performance. At gross weight (1,600 lb) in high density altitude (DA ~2,800 ft on a hot July day), the airplane's climb performance is severely degraded. The best rate of climb (Vy) is 68 KIAS, but the actual climb rate is low. This is not a limitation of the pilot — it is a limitation of the airplane. Respect it. Do not attempt a steep climb or aggressive maneuver in these conditions. A shallow, steady climb at Vy is the correct technique.
Carburetor ice can form on approach in warm, moist conditions.
The FAA icing probability chart shows serious carburetor icing risk at glide power (reduced power on approach) in temperatures between roughly 20°C and 30°C with high relative humidity. The C150's Continental O-200-A is carbureted; it has no fuel injection or alternate air system. Carburetor heat is the only tool. On approach in warm, moist conditions, apply carburetor heat proactively. If the engine loses power on approach, apply full carburetor heat immediately and diagnose quickly. The symptoms are engine roughness and a dropping tachometer — not a dramatic power cut.
At low altitude, airspeed is your life — never allow it to decay below the safe margin.
The C150's stall speed in landing configuration (flaps down) is 42 KIAS (Vs0). Vref (approach speed) is 60 KIAS — a margin of 18 KIAS above stall. On approach, maintain Vref or above. If the engine loses power, lower the nose to maintain airspeed — do not try to stretch the glide. If you must go around, do so with full power and a shallow climb angle. At 300 ft AGL, you do not have altitude to recover from a stall. The margin to stall is zero.
The C150's light wing loading makes it gust-sensitive and prone to stall/spin on the base-to-final turn.
The C150 is a light airplane with a light wing loading. It is sensitive to gusts and turbulence, especially on the base-to-final turn where the bank angle is steep and the airspeed is low. An uncoordinated turn (slip or skid) at low altitude increases the stall speed and reduces the margin to the critical angle of attack. Keep the ball centered. Maintain a shallow bank angle on base-to-final. Never allow the airspeed to decay in a turn at low altitude.
A go-around at low altitude with a sick engine is marginal — land if the runway is made.
If the engine loses power on approach and you are at 300 ft AGL with the runway made, land. A go-around at low altitude with a sick engine is extremely marginal — the C150 at gross weight in high density altitude has marginal climb performance even at full power. If the engine is at reduced power, a go-around is asking the airplane to do something it may not be able to do. Land if the runway is made. If the runway is not made or the power loss is severe, declare an emergency and prepare for a forced landing in the best available terrain.
Off Runway 16 at KCLW, the off-field environment is dense development — a forced landing is not an option.
Runway 16's climb-out environment (heading 155°) is dense development, low-density development, and medium development. There is no open field, no park, no water. A forced landing in that terrain is not survivable. This is not hypothetical — it is the USGS NLCD ground cover off that runway end. Respect the off-field environment. If the engine fails on the Runway 16 departure at low altitude, you do not have a forced-landing option. You must either restore power and return to the airport, or declare an emergency and prepare for the worst. The same is true off Runway 34's climb-out (heading 335°): low-density development and medium development. There is no good off-field option at KCLW.
Built from the real accident record
Scenario built from NTSB CEN23FA401 (2023 C150K fuel starvation / stall on descent) and WPR18FA244 (2018 C150 stall on initial climb, high density altitude, flap misconfiguration). Both fatal accidents in the C150 type. Localized to Clearwater Air Park (KCLW), FL.
NTSB reports: CEN23FA401 · WPR18FA244
ACS tasks: PA.II.A — Preflight Inspection · PA.II.B — Engine Starting / Systems Preflight · PA.III.A — Normal Takeoff and Climb · PA.IV.A — Normal Approach and Landing · PA.IX.C — Emergency Approach and Landing · PA.I.H — Human Factors
Relevant FARs: §91.3 · §91.13 · §91.103
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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