Low and Slow Over Tampa North
Carburetor ice, partial power loss, and an uncoordinated turn at 400 ft AGL — the stall/spin trap in the Piper Warrior
The scenario
Departing Tampa North Aero Park Airport (X39), Tampa, FL — Runway 14, climbing out on a 141° heading. Elevation 68 ft MSL. The runway is short (3,541 ft) and the off-field environment is poor: medium development, low-density development, and wooded wetland in all directions. There is no open field, no clear alternate landing surface.
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 one mile 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.' The Piper Warrior's carbureted Lycoming O-320 is susceptible in these conditions.
You are 400 ft AGL, climbing through 79 KIAS (Vy, best rate of climb), heading 141°, when the engine begins to run rough. Power is noticeably down — the tachometer is dropping. The off-field environment is dense development and wooded wetland ahead. X39 is non-towered (CTAF); you are in Class G airspace, but the overlying Tampa Class B begins at 3,000 ft MSL.
Aircraft: Piper PA-28-161 Warrior, solo, full fuel (48 gallons usable), within limits. Carbureted Lycoming O-320-D, 160 hp, fixed-pitch prop, fuel selector on LEFT tank (you switched from RIGHT after takeoff per standard procedure). 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': 'X39 · Tampa North Aero Park'}
- {'label': 'Runways', 'value': '14/32'}
- {'label': 'Elevation', 'value': '68 ft'}
- {'label': 'Aircraft', 'value': 'PA-28-161'}
- {'label': 'Dominant phase', 'value': 'Takeoff / Landing'}
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 power. During a go-around attempt, the pilot failed to maintain adequate airspeed and stalled, colliding 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 partial left magneto failure during initial climb after takeoff. The flight instructor failed to maintain airspeed and the airplane stalled. The probable cause was partial magneto failure due to 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 to the accident was inadequate preflight performance planning for the soft, grass field with a quartering tailwind.
The consistent thread across all these events: the PA-28-161 is a forgiving trainer, but at low altitude with partial power and low airspeed, the stall/spin trap is real. The accidents cited above occurred at other airports and in other conditions — NOT at Tampa North Aero Park Airport. X39 has its own accident history (see field dominant patterns: 27.3% loss of control inflight, 18.2% loss of control ground, 9.1% stall/spin), but these specific NTSB events happened elsewhere. The scenario is localized to X39 to make the off-field environment real and consequential for you as a student here.
The off-field environment at X39 is poor: medium development, low-density development, and wooded wetland in all directions off both runway ends. There is no open field, no clear alternate landing surface. A forced landing here is survivable only if the pilot maintains best glide speed (73 KIAS) and flies the airplane all the way to touchdown at the slowest possible speed. An uncoordinated turn at 400 ft AGL with partial power and low airspeed is a stall/spin setup — the Warrior's forgiving wing helps, but the terrain is unforgiving.
The real accidents cited above occurred at other airports — NOT at Tampa North Aero Park. The scenario is localized to X39 to make the off-field environment real and consequential for you as a student here.
Key lesson — In warm, moist Gulf Coast air, the PA-28-161'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 terrain, the decision window is measured in seconds — not minutes. Off Runway 14 at X39, the off-field environment is poor: medium development, low-density development, and wooded wetland. A delayed response means a forced landing in unforgiving terrain, not a field landing. An uncoordinated turn at 400 ft AGL with partial power is a stall/spin trap — maintain airspeed discipline and fly the airplane.
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 X39. 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 is carbureted; it has no fuel injection, 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 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 X39, the off-field environment is poor in all directions — maintain best glide speed and airspeed discipline.
The off-field environment off both runway ends is medium development, low-density development, and wooded wetland. There is no open field, no clear alternate landing surface. A forced landing here is survivable only if the pilot maintains best glide speed (73 KIAS) and flies the airplane all the way to touchdown at the slowest possible speed. Impact energy rises with the square of touchdown speed — the slowest possible speed is critical. The Warrior's forgiving wing helps, but the terrain is unforgiving. Airspeed discipline is non-negotiable.
An uncoordinated turn at low altitude with partial power is a stall/spin setup.
At 400 ft AGL with partial power and low airspeed, an uncoordinated turn (skidding or slipping) is a stall/spin trap. The Warrior's wing is forgiving, but the margin is thin. If you must turn back to the runway, maintain coordinated flight, keep the airspeed above 73 KIAS (best glide), and use shallow bank angles. Better yet, apply carb heat first and address the cause before maneuvering. A stall/spin at 400 ft AGL is unrecoverable.
Proactive carb heat use in conducive conditions is not optional.
The PA-28-161 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 29°C and dew point near 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 400 ft AGL over dense terrain 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, fatal), and CEN12FA188 (2012 PA-28-161 stall during takeoff, fatal). Localized to Tampa North Aero Park Airport (X39), 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 Assessment · PA.II.B — Engine Starting / Systems Preflight · PA.III.A — Normal 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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