Rough Climb Over Tampa Bay
Partial power loss on departure from KPIE — carburetor ice, tank management, and a water-surrounded airport force a critical decision at low altitude
The scenario
Departing St. Petersburg Clearwater International Airport (KPIE), Pinellas Park, FL — Runway 04, climbing out on a 040° heading. Elevation 11 ft MSL; the runway is essentially at sea level. You are in Class D airspace; the tower is open and active (0600–2300 local).
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 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 450 ft AGL, climbing through 79 KIAS (Vy, best rate of climb), heading 040°, when the engine begins to run rough. Power is noticeably down — the tachometer is dropping. The water of Tampa Bay fills the windscreen ahead and to your left. The tower is aware of your departure; you are in a standard left turn to downwind for Runway 22 (the reciprocal runway, over land) if you need to return.
Aircraft: Piper PA-28-161 Warrior, solo, right tank selected, fuel quantity verified at preflight, within limits. Carbureted Lycoming O-320-D, fixed-pitch prop, steam panel, LEFT/RIGHT fuel selector (no BOTH position). 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 heads-down on the climb and focused on the heading.
- {'label': 'Field', 'value': 'KPIE · St. Petersburg Clearwater'}
- {'label': 'Runways', 'value': '4/22 · 18/36'}
- {'label': 'Elevation', 'value': '11 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 in the PA-28-161 Warrior? (Pick all that apply; this records your baseline.)
What the record shows
What the NTSB files show
NTSB CEN12LA175 (2012): A Piper PA-28-161 on an instrument instructional flight encountered carburetor ice during climb through 6,500 feet. The engine lost power progressively. A contributing factor was limited carburetor heat valve travel from recent maintenance — the heat valve could not open fully, preventing maximum carb heat application. The probable cause was carburetor icing in conditions conducive to serious icing.
NTSB LAX03LA238 (2003): A Piper PA-28-161 experienced partial engine power loss during initial climb from Torrance due to carburetor icing. The pilot did not apply carburetor heat. 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.
NTSB CHI05LA226 (2005, FATAL): A Piper PA-28-161 on an instructional flight lost engine power due to partial left magneto failure during initial climb after takeoff and subsequently stalled. The accident resulted from improper maintenance, with contributing factors including the instructor's failure to maintain airspeed and follow emergency procedures.
NTSB ERA14LA141 (2014): A Piper PA-28-161 experienced partial engine power loss during takeoff from Atlantic City International Airport. The pilot executed a forced landing to the airport perimeter road. The probable cause was a partial loss of engine power for reasons that could not be determined during postaccident examination.
The local environment at KPIE makes this scenario particularly unforgiving: Runway 04's departure end is open water — Tampa Bay. An engine failure on the Runway 04 departure at low altitude is a ditching, not a field landing. There is no open field, no road, no park. The water is the off-field environment. This is not hypothetical; it is the USGS NLCD ground cover off that runway end.
The real accidents cited above occurred at other airports and in other aircraft — NOT at St. Petersburg Clearwater International Airport. KPIE has its own accident history (dominant patterns: LOSS_OF_CONTROL_INFLIGHT 21.2%, LOSS_OF_CONTROL_GROUND 15.2%, STALL_SPIN 12.1%, GEAR_UP_LANDING 9.1%, OBSTACLE_ON_TAKEOFF_LANDING 9.1%), but these specific events happened elsewhere. The scenario is localized to KPIE 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 PA-28-161 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.
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 04 at KPIE, the off-field environment is Tampa Bay: a delayed response means a ditching, not a field landing. Additionally, remember that the PA-28-161 has LEFT/RIGHT fuel selector with no BOTH position — tank management is your responsibility, and fuel starvation from not switching tanks is a real risk in this 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 KPIE. 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 KPIE Runway 04, an engine failure on departure is a ditching.
The off-field environment off Runway 04's departure end (heading 040°) is open water — Tampa Bay. There is no alternate landing surface. If the engine quits on the Runway 04 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 04.
The PA-28-161 has LEFT/RIGHT fuel selector — no BOTH position. Tank management is your job.
Unlike Cessnas, the Piper Warrior has no BOTH position on the fuel selector. You must manually switch tanks during flight. Fuel starvation from forgetting to switch tanks is a real and recurring accident in Piper aircraft. Establish a tank-switching protocol: switch every 30 minutes of flight, or per the POH recommendation. Monitor fuel quantity and pressure. If you forget to switch and one tank runs dry, the engine will quit. At 450 ft AGL over water, that is a ditching. Tank management is not optional — it is a core skill in this airplane.
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 28–30°C and dew point near 22–24°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 450 ft AGL over Tampa Bay is waiting too long.
Built from the real accident record
Scenario built from NTSB CEN12LA175 (2012 PA-28-161 carburetor ice / power loss during climb), LAX03LA238 (2003 PA-28-161 carb ice / stall on go-around), CHI05LA226 (2005 PA-28-161 magneto failure / stall), ERA14LA141 (2014 PA-28-161 partial power loss at takeoff), and local-environment precedents WPR10FA264, CHI08LA197, IAD05LA133, DEN03LA139. Anonymized and localized to KPIE.
NTSB reports: CEN12LA175 · LAX03LA238 · CHI05LA226 · ERA14LA141 · WPR10FA264 · CHI08LA197 · IAD05LA133 · DEN03LA139
ACS tasks: PA.I.F — Weather Information · PA.I.G — Cross-Country Flight Planning · PA.IX.C — Emergency Approach and Landing · PA.I.H — Human Factors · PA.II.B — Engine Starting / Systems Preflight
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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