Rough Climb Over Tampa Bay
Carburetor ice, partial power loss, and dense urban terrain — the decision window is seconds
The scenario
Departing Tampa International Airport (KTPA), Tampa, FL — Runway 10, climbing out on a 092° heading. Elevation 26 ft MSL; the runway is essentially at sea level.
It is a hazy Florida afternoon in late spring: OAT 27°C, dew point 21°C, altimeter 29.92. Scattered clouds at 2,500 ft, light rain shower two miles to the east. 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 particularly susceptible in these conditions.
You are 500 ft AGL, climbing through 79 KIAS (Vy), heading 092°, when the engine begins to run rough. Power is noticeably down — the tachometer is dropping. Dense development surrounds the airport; off Runway 10's departure end, the off-field environment is mostly dense development with some open developed areas (parks, large lots) and wooded wetland. KTPA's tower is active 24 hours; you are in Class B airspace (ceiling 10,000 MSL).
Aircraft: Piper PA-28-161 Warrior, solo, full fuel (48 gal usable), within limits. Carbureted Lycoming O-320-D, fixed-pitch prop, steam panel, fuel selector currently on RIGHT tank (you switched from LEFT at 500 ft AGL per your fuel plan). 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 fuel selector switch. You are now at a critical decision point.
- {'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 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 achieve full 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 attempted a go-around but failed to maintain adequate airspeed, resulting in a stall and collision with power lines and terrain. The probable causes were carburetor icing and the pilot's failure to use carburetor heat and maintain airspeed during the recovery.
NTSB CEN09CA532 (2009): A Piper PA-28-161 lost engine power during descent one mile from the airport due to carburetor icing. The pilot made a forced landing in a corn field and sustained a broken arm. The probable cause was the pilot's failure to use carburetor heat in conditions conducive to icing.
NTSB ATL04LA124 (2004): A Piper PA-28-161 lost engine power during climb in conditions favorable for carburetor ice formation. The pilot made a forced landing on a beach. The probable cause was the pilot's failure to use carburetor heat when weather conditions were favorable for ice formation.
NTSB NYC03LA012 (2002): A Piper PA-28-161 student pilot on a solo flight lost engine power near Lakewood, New Jersey, due to carburetor ice. The probable cause was the pilot's improper use of carburetor heat, which failed to remove accumulated ice.
The real accidents cited above occurred at other airports and in other regions — NOT at Tampa International Airport. KTPA has its own accident history (see field dominant patterns: FORCED_LANDING 22.2%, LOSS_OF_CONTROL_INFLIGHT 11.1%, GEAR_UP_LANDING 6.7%), but these specific carburetor ice events happened elsewhere. The scenario is localized to KTPA to make the off-field environment real and consequential for you as a pilot 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 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. Off Runway 10 at KTPA, the off-field environment is dense development with some open areas: a forced landing there is difficult but possible. Off Runway 28, you are over the airport. Know your terrain.
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 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.
The PA-28-161 has LEFT / RIGHT fuel selector — no BOTH position. Tank management is your job.
Unlike some Cessnas, the Warrior has no BOTH position. You must actively manage fuel tank selection. Fuel starvation from improper tank selection or failure to switch tanks is a real risk in the PA-28-161. Plan your tank-switching intervals in advance (typically every 15–30 minutes depending on fuel quantity and flight plan). When an engine anomaly occurs, systematically troubleshoot the fuel system: verify selector position, check fuel quantity in each tank, and confirm the pump is on. Do not assume a mechanical failure without first ruling out fuel-system issues.
At KTPA, the off-field environment varies by runway. Know your terrain.
Off Runway 10's departure end (heading 092°), the off-field environment is dense development with some open areas (parks, large lots) and wooded wetland — a forced landing there is difficult but possible. Off Runway 28's departure end (heading 272°), you are over the airport itself. Off Runways 19L/19R (heading 182°), the environment is dense development with pasture/hay — also difficult. Off Runways 01L/01R (heading 002°), the environment is dense development with open areas. A forced landing at KTPA is not a ditching (no water off the runway ends), but it is a landing in or near dense urban terrain. Know which runway you are using and what lies ahead.
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 27°C and dew point near 21°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 Tampa 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 / go-around stall), CEN09CA532 (2009 PA-28-161 carb ice / forced landing), ATL04LA124 (2004 PA-28-161 carb ice / beach landing), and NYC03LA012 (2002 PA-28-161 improper carb heat use). Regional fuel-management precedents WPR24LA167, GAA19CA534, WPR12LA023. Localized to KTPA.
NTSB reports: CEN12LA175 · LAX03LA238 · CEN09CA532 · ATL04LA124 · NYC03LA012 · WPR24LA167 · GAA19CA534 · WPR12LA023
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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