Low Altitude, Uncoordinated Turn
Carburetor ice, partial power loss, and the stall/spin trap at low altitude — the Warrior's forgiving wing is no safety net if you lose airspeed
The scenario
Departing Tampa International Airport (KTPA), Runway 19R, climbing out on a 182° heading over dense development and medium-density residential areas. Elevation 26 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 29.91. Scattered clouds at 2,800 ft, light rain showers two miles to the northeast. Visibility 9 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.' The Warrior's carbureted Lycoming O-320 is susceptible to carburetor ice in these conditions.
You are 500 ft AGL, climbing through 79 KIAS (Vy, best rate of climb), heading 182°, when the engine begins to run rough. Power is noticeably down — the tachometer is unwinding. Dense development fills the view ahead and to both sides. KTPA's tower is active 24/7 and is aware of your departure; you are in Class B airspace (ceiling 10,000 MSL, floor 1,200 MSL — you are below the floor, in Class E).
Aircraft: Piper PA-28-161 Warrior, solo, full fuel (left and right tanks), within limits. Carbureted Lycoming O-320, fixed-pitch prop, steam panel, fuel selector on LEFT (the tank you selected for takeoff). Nothing was written up; the airplane was airworthy at departure.
Pilot: you — a Private pilot, current, roughly 180 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 focused on the climb and tower communications.
- {'label': 'Field', 'value': 'KTPA · Tampa'}
- {'label': 'Runways', 'value': '10/28 · 19L/01R · 19R/01L'}
- {'label': 'Elevation', 'value': '26 ft'}
- {'label': 'Aircraft', 'value': 'PA-28-161'}
- {'label': 'Dominant phase', 'value': 'Landing / Takeoff'}
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 engine lost partial power. During a go-around attempt, the pilot failed to maintain adequate airspeed, resulting in a stall. The airplane collided with power lines and terrain. The probable cause was carburetor icing and the pilot's failure to use carburetor heat and maintain airspeed during the aborted landing.
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, resulting in a stall. The accident was fatal. Contributing factors included improper maintenance by company personnel, resulting in the magneto failure.
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. 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 common thread: the Piper Warrior is a forgiving, docile airplane — but it will stall if you lose airspeed in a bank at low altitude. The accidents cited above occurred at other airports and in different circumstances — NOT at Tampa International. KTPA's own accident corpus shows STALL_SPIN as a significant risk (the Warrior's wing is forgiving, but low-altitude uncoordinated turns in partial-power situations are a trap). The off-field environment at KTPA is dense development on all runway departures — there is no open field, no water, no road. A forced landing in dense development requires maintaining airspeed and finding the least-obstructed surface.
The real accidents cited above occurred at other airports — NOT at KTPA. The scenario is localized to KTPA 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 carbureted Warrior is insidious. It builds gradually, the first symptom is roughness and a dropping tachometer (not a dramatic power cut), and by the time it is obvious, it may be too late for a comfortable recovery. The fix — full carburetor heat, immediately, at the first sign of roughness in conducive conditions — is simple. The failure is always a delay. And the stall/spin trap is real: an uncoordinated turn at low altitude with partial power loss and degrading airspeed is a fatal combination.
Key lesson — In warm, moist Gulf Coast air, the Warrior's carbureted O-320 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 dense development, the decision window is measured in seconds — not minutes. An uncoordinated turn in a bank with partial power loss is a stall/spin risk. Maintain airspeed (73 KIAS best glide) and coordinate the turn. Off Runway 19R at KTPA, the off-field environment is dense development: a forced landing there requires maintaining airspeed and finding the least-obstructed surface.
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 KTPA. You do not need visible ice, freezing temperatures, or IMC. Warm, moist air at reduced power is the classic carb-ice environment. The Warrior's Lycoming O-320 is carbureted; it has no 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 Warrior, 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.
An uncoordinated turn at low altitude with partial power loss is a stall/spin trap.
The Warrior's wing is forgiving and docile — but it will stall if you lose airspeed in a bank. At 500 ft AGL with a rough engine and partial power loss, a 180° turn back to the airport without first addressing the engine problem is a stall/spin risk. If you must turn, maintain airspeed (70–75 KIAS, slightly above best glide to maintain control authority in the bank), apply carburetor heat, and coordinate the turn. The bank itself, combined with power loss and distraction, conspires to slow your airspeed. Stall speed in the clean Warrior is 50 KIAS; in landing configuration it is 44 KIAS. At 68 KIAS in a bank with partial power, you are marginal.
The Warrior has LEFT / RIGHT fuel selector (no BOTH position) — tank management is the pilot's job.
Unlike some other trainers, the Warrior does not have a BOTH position on the fuel selector. You must actively switch tanks during flight to balance fuel and avoid starvation. A rough engine at low altitude could be carburetor ice — or it could be fuel starvation from forgetting to switch tanks. Always confirm the fuel selector position as part of your engine-roughness diagnosis. In this scenario, the selector is on LEFT (the tank you selected for takeoff), so fuel starvation is not the issue — but it is a real risk in the Warrior.
At KTPA, all runway departures are over dense development — there is no open field.
The off-field environment off all runway ends at KTPA is dense development, medium development, or open developed areas (parks, large lots). There is no open field, no water, no road. A forced landing in dense development requires maintaining airspeed (73 KIAS best glide) and finding the least-obstructed surface — a park, a parking lot, a street. Flaps should be used for the slowest possible touchdown speed (impact energy rises with the square of speed). A controlled forced landing is survivable if you maintain airspeed and avoid obstacles.
Proactive carb heat use in conducive conditions is not optional.
The Warrior POH and the FAA Pilot's Handbook of Aeronautical Knowledge both recommend applying carburetor heat when conditions are conducive to icing — before the symptom appears. In a Gulf Coast summer departure, with OAT near 28–29°C and dew point near 22–23°C, that means applying carb heat during the run-up check (and confirming the expected RPM drop, then recovery) and considering its use during climb in visible moisture or high humidity. Waiting for the roughness to appear at 500 ft AGL over dense development is waiting too long.
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 Tampa International Airport (KTPA).
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.B — Crosswind 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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