Engine Failure on Climb-Out — Tampa North
Carburetor ice, partial power loss, and a field surrounded by development and wetland — forced landing site selection under pressure
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 essentially at sea level. You are on a local VFR flight — a practice area hop to work on slow flight and stalls with your CFI.
It is a warm, humid Florida afternoon in late spring: OAT 29°C, dew point 23°C, altimeter 29.91. Scattered clouds at 2,500 ft, light rain showers visible to the northeast. Visibility 9 SM. The conditions are classic Gulf Coast — warm, moist, and exactly the environment the FAA icing probability chart marks as 'serious icing at glide power, moderate icing at cruise power.' The C172N's carbureted Lycoming O-320 is particularly susceptible in these conditions.
You are 350 ft AGL, climbing through 70 KIAS (near Vy of 73 KIAS), heading 141°, when the engine begins to run rough. Power is noticeably down — the tachometer is dropping. The off-field environment ahead is medium-density development mixed with low-density development and wooded wetland — no clear open field. X39 is non-towered (CTAF); you are in Class G airspace, but the overlying Tampa Class B (3,000 MSL ceiling) is above you. You are below 1,000 ft AGL.
Aircraft: Cessna 172N, solo, full fuel, within limits. Carbureted Lycoming O-320, fixed-pitch prop, steam panel (attitude and heading vacuum-driven), fuel selector on BOTH. The airplane was airworthy at departure; nothing was written up.
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 focused on the climb and did not anticipate the conditions would be conducive to carb ice. You are now at 350 ft AGL with a rough engine and a field surrounded by development and wetland.
- {'label': 'Field', 'value': 'X39 · Tampa North Aero Park'}
- {'label': 'Runways', 'value': '14/32'}
- {'label': 'Elevation', 'value': '68 ft'}
- {'label': 'Aircraft', 'value': 'C172N'}
- {'label': 'Dominant phase', 'value': 'Takeoff / Landing'}
The decision
Before we get into the decision tree — what do you already know about engine failure on climb-out in the C172N? (Pick all that apply; this records your baseline.)
What the record shows
What the NTSB files show
NTSB CEN24LA362 (2024): A Cessna 172N encountered light rain and carburetor ice at 1,800 ft AGL. The engine ran rough and lost power. The probable cause was carburetor ice formation in conditions conducive to serious icing, with insufficient time and altitude for carburetor heat to clear the accumulated ice. The pilot had not applied carburetor heat proactively in conditions that clearly warranted it.
NTSB CEN14LA276 (2014): A Cessna 172N on a cross-country flight experienced engine roughness and power loss at cruise altitude in conditions conducive to carb icing. The pilot made a forced landing on an island; the aircraft nosed over in soft sand. The pilot survived. The probable cause could not be determined due to premature aircraft release — but the conditions and symptoms are consistent with carburetor ice.
NTSB ANC26LA001 (2025): A Cessna 172 on an instructional flight experienced progressive engine power loss during training maneuvers despite carburetor heat application. The pilot made a forced landing on a road; the aircraft struck a rock during landing roll and nosed over. Atmospheric conditions indicated serious icing conditions in pressure-type carburetors. The lesson: even with carb heat applied, the ice can be heavy enough to require time to clear.
NTSB CEN14LA374 (2014): A Cessna 172N on a personal local flight experienced partial engine power loss during cruise due to failure of the dual magneto system caused by loose mounting screws. The pilot made a forced landing to a cornfield. Improper maintenance during the annual inspection was a contributing factor. The lesson: not all engine failures are carb ice — but the response (establish best glide, find the best landing area, execute a controlled landing) is the same.
The real accidents cited above occurred at other airports and in other aircraft — NOT at Tampa North Aero Park (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%). 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: engine failure on climb-out is survivable if the pilot (1) recognizes the problem early, (2) applies the correct immediate response (carb heat, or if that fails, establish best glide), and (3) executes a controlled forced landing in the best available terrain. The failure is always a delay or a poor landing-site choice.
Key lesson — In warm, moist Gulf Coast air, the C172N'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 on climb-out, the decision window is measured in seconds — not minutes. Off Runway 14 at X39, the off-field environment is development and wetland: a forced landing there is survivable if flown correctly (best glide, slowest touchdown speed, doors unlatched, master off before impact), but it is not a walk in the park. The best outcome is recognizing the problem early and returning to the airport.
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 C172N's Lycoming O-320 is carbureted; it has 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 C172N, 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, an engine failure on climb-out requires immediate decision-making.
The off-field environment off Runway 14's departure end (heading 141°) is medium-density development, low-density development, and wooded wetland. There is no clear open field. If the engine fails on the Runway 14 departure and altitude is sufficient, the primary option is to return to X39 and land on Runway 32. If altitude is insufficient to return, a forced landing in the development/wetland is the outcome. Best glide is 65 KIAS. Doors unlatched before landing. 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 C172N 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 22–23°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 350 ft AGL on the departure is waiting too long.
Built from the real accident record
Scenario built from NTSB CEN24LA362 (2024 C172N carburetor ice / power loss), CEN14LA276 (2014 C172N engine roughness / forced landing), ERA09LA517 (2009 C172N total power loss), ANC26LA001 (2025 C172N progressive power loss despite carb heat), WPR15LA086 (2015 C172N partial power loss / mountainous terrain), CEN14LA374 (2014 C172N magneto failure / forced landing), WPR14LA099B (2014 water-contaminated fuel / forced landing), and WPR12LA306 (2012 C172N exhaust valve failure / forced landing). Anonymized and localized to X39 (Tampa North Aero Park).
NTSB reports: CEN24LA362 · CEN14LA276 · ERA09LA517 · ANC26LA001 · WPR15LA086 · CEN14LA374 · WPR14LA099B · WPR12LA306
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 · PA.V.A — Preflight Inspection · PA.VIII.A — Slow Flight
Relevant FARs: §91.3 · §91.13 · §91.185 · §91.207
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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