Rough Climb Over Tampa Development
Carburetor ice, partial power loss, and poor off-field options — the decision window is tight
The scenario
Departing Tampa North Aero Park Airport (X39), Tampa, FL — Runway 14, climbing out on a 141° heading. Elevation 68 ft MSL. 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 500 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 ahead is medium development, low-density development, and wooded wetland — poor forced-landing terrain. X39 is non-towered (CTAF); you are in Class G airspace below 3,000 ft MSL. Above 3,000 ft MSL, you will enter the overlying Tampa Class B airspace (3,000 MSL → 10,000 MSL).
Aircraft: Piper PA-28-161 Warrior, solo, full fuel, within limits. Carbureted Lycoming O-320-D, fixed-pitch prop, steam panel, fuel selector on LEFT tank. 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 the engine sounded fine at first.
- {'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 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 experienced progressive engine power loss due to carburetor icing during climb through 6,500 feet. The probable cause was carburetor icing formation in conditions conducive to serious icing, with a contributing factor of limited carburetor heat valve travel from recent maintenance. The pilot's failure to apply carburetor heat early enough allowed ice to accumulate to a critical level.
NTSB LAX03LA238 (2003): A Piper PA-28-161 experienced partial engine power loss during initial climb from Torrance due to carburetor icing. 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. The stall occurred because the pilot allowed airspeed to decay below Vs0 (44 KIAS) while trying to stretch the approach.
NTSB CEN09CA532 (2009): A Piper PA-28-161 on a personal return-to-airport flight lost engine power during descent due to carburetor icing one mile from the airport. The pilot made a forced landing in a corn field and sustained a broken arm. The probable cause was the pilot's failure to apply carburetor heat in icing-conducive conditions.
NTSB ATL04LA124 (2004): A Piper PA-28-161 on a personal flight lost engine power during climb in conditions favorable for carburetor ice formation, and the pilot made a forced landing on a beach. The accident was attributed to the pilot's failure to use carburetor heat when weather conditions were favorable for carburetor ice formation.
NTSB NYC03LA012 (2002): A Piper PA-28-161 student pilot on a solo instructional flight lost engine power near Lakewood, New Jersey, due to carburetor ice. The accident resulted from the student pilot's improper use of carburetor heat — applying it only partially or cycling it on and off — which failed to remove accumulated ice. A contributing factor was carburetor icing conditions.
The real accidents cited above occurred at other airports and in other aircraft — NOT at Tampa North Aero Park Airport (X39). X39 has its own accident history (see field dominant patterns: LOSS_OF_CONTROL_INFLIGHT 27.3%, LOSS_OF_CONTROL_GROUND 18.2%, OBSTACLE_ON_TAKEOFF_LANDING 9.1%, HARD_LANDING 9.1%, STALL_SPIN 9.1%), but these specific carburetor ice 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 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. CEN12LA175 also shows that a carburetor heat valve with limited travel (from maintenance) can prevent full heat application — a maintenance issue that compounds the pilot's error.
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 poor terrain, the decision window is measured in seconds — not minutes. Off Runway 14 at X39, the off-field environment is medium development, low-density development, and wooded wetland: a delayed response means a forced landing in poor terrain, not a comfortable field landing. Know the off-field environment before you depart.
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-D is carbureted; it has no fuel injection or alternate air system. Carburetor heat is the only tool. Understand the icing probability chart and apply it to your preflight briefing.
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. A 50–100 RPM drop from cruise RPM is a red flag.
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. NTSB NYC03LA012 shows that improper carb heat use (partial or cycling) fails to clear ice.
At X39 Runway 14, the off-field environment is poor forced-landing terrain.
The off-field environment off Runway 14's departure end (heading 141°) is medium development, low-density development, and wooded wetland — poor forced-landing terrain. There is no open field, no clear road, no park. If the engine quits on the Runway 14 departure and altitude is insufficient to return to the airport, the outcome is a forced landing in that development. This is not a worst-case scenario; it is the geographic reality. Best glide is 73 KIAS. 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 14.
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°C and dew point near 22°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 poor terrain 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), 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 precedents CHI91DCJ01, ANC93LA040, FTW89FA151 inform weather-recognition and decision-commitment lessons. Anonymized and localized to X39.
NTSB reports: CEN12LA175 · LAX03LA238 · CEN09CA532 · ATL04LA124 · NYC03LA012 · CHI91DCJ01 · ANC93LA040 · FTW89FA151
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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