The Impossible Turn at Albert Whitted
Carburetor ice, partial power loss, and an uncoordinated low-altitude turn — the stall/spin trap at KSPG
The scenario
Departing Albert Whitted Airport (KSPG), St. Petersburg, FL — Runway 07, climbing out on a 062° heading. Elevation 7 ft MSL. The runway is essentially at sea level, and the off-field environment off Runway 07's departure end is open water — Tampa Bay.
It is a hazy Florida afternoon in late spring: OAT 28°C, dew point 22°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 350 ft AGL, climbing through 79 KIAS (Vy, best rate of climb), heading 062°, when the engine begins to run rough. Power is noticeably down — the tachometer is dropping. The water of Tampa Bay fills the windscreen ahead. KSPG's tower is part-time (0700–2100) and is open; you are in Class D airspace.
Aircraft: Piper PA-28-161 Warrior, solo, full fuel (both tanks), within limits. Carbureted Lycoming O-320-D, fixed-pitch prop, steam panel, fuel selector on LEFT tank (you switched to LEFT 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 and focused on maintaining Vy.
- {'label': 'Field', 'value': 'KSPG · Albert Whitted'}
- {'label': 'Runways', 'value': '7/25 · 18/36'}
- {'label': 'Elevation', 'value': '7 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 power. During a go-around attempt, the pilot failed to maintain adequate airspeed, resulting in a stall and collision 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 emergency maneuver.
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. The flight instructor failed to maintain airspeed and follow emergency procedures, resulting in a stall. The accident was fatal. Contributing factors included improper maintenance of the magneto system and 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. The probable cause was the pilot's failure to maintain airplane control during takeoff, resulting in an aerodynamic stall. Contributing factors were inadequate preflight planning for soft-field conditions and failure to obtain a weather briefing.
The common thread in all three accidents: partial power loss (carburetor ice, magneto failure, soft-field performance degradation) combined with the pilot's failure to maintain airspeed and coordination. In the PA-28-161, stall speed in a bank is higher than in level flight — at 20° bank, stall speed rises to approximately 54 KIAS; at 30° bank, to approximately 58 KIAS. At 350 ft AGL in a turn back to the airport with a rough engine, the margin between best glide (73 KIAS) and stall speed in the bank is only 15–20 KIAS. That margin evaporates if the pilot is distracted by the engine problem and lets the turn become uncoordinated.
The real accidents cited above occurred at other airports and in other aircraft — NOT at Albert Whitted Airport. KSPG has its own accident history (see field dominant patterns), but these specific events happened elsewhere. The scenario is localized to KSPG to make the off-field environment real and consequential for you as a student here.
The consistent lesson: at low altitude with partial power, the 'impossible turn' is not impossible — but it is a stall/spin trap if the pilot loses coordination and airspeed. The Warrior is a forgiving airplane, but forgiveness has limits. Maintain airspeed, maintain coordination, and address the engine problem (carburetor heat) immediately.
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 07 at KSPG, the off-field environment is Tampa Bay: a delayed response means a ditching, not a field landing. If you attempt a turn back to the airport without addressing the engine problem, maintain 73 KIAS best glide and keep the turn coordinated — uncoordinated flight at low altitude is a stall/spin entry.
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 KSPG. 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 KSPG Runway 07, an engine failure on departure is a ditching.
The off-field environment off Runway 07's departure end (heading 062°) is open water — Tampa Bay. There is no alternate landing surface. If the engine quits on the Runway 07 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 07.
The 'impossible turn' at low altitude is a stall/spin trap if you lose coordination.
At 350 ft AGL in a turn back to the airport with a rough engine, the margin between best glide (73 KIAS) and stall speed in a bank is only 15–20 KIAS. If you focus on the heading change and let the turn become uncoordinated, the airspeed decays below stall speed in the bank. The Warrior's docile wing is forgiving in normal flight, but at low altitude with a degraded engine, forgiveness has limits. Maintain 73 KIAS, keep the turn coordinated (ball in the center), and address the engine problem (carburetor heat) immediately. The turn is not impossible — but it is a stall/spin trap if you lose airspeed and coordination.
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 on initial climb), and CEN12FA188 (2012 PA-28-161 stall during takeoff from soft field). Localized to KSPG with real off-field environment (open water off Runway 07, dense development off Runway 25).
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.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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