Engine Failure on Initial Climb — Tampa North Aero Park
Carburetor ice, density altitude, and a marginal climb — the C172M at gross weight in summer heat
The scenario
Departing Tampa North Aero Park Airport (X39), Tampa, FL — Runway 14, climbing out on a 141° heading. Elevation 68 ft MSL; a non-towered field in the Tampa Class B environment. You are a Private pilot with 180 hours total, current, and you are flying a Cessna 172M — the 150-hp carbureted variant, not the later 172N. This is a marginal-performance airplane, especially in summer heat and at gross weight.
It is a hazy Florida summer afternoon: OAT 32°C (90°F), dew point 24°C (75°F), altimeter 29.92. Scattered clouds at 2,800 ft AGL. Visibility 8 statute miles. Density altitude is approximately 2,400 ft — the airplane will climb and accelerate as if it is at 2,400 ft elevation, not 68 ft. The FAA carburetor icing probability chart marks these conditions as 'serious icing at glide power, moderate icing at cruise power.' You did not apply carburetor heat during the run-up because the engine ran smoothly on the ground.
Aircraft: Cessna 172M, solo, full fuel (36 gallons), within limits. Lycoming O-320-E2D, 150 hp, carbureted, fixed-pitch prop, fuel selector BOTH, steam panel (attitude and heading indicators driven by vacuum). Nothing was written up; the airplane was airworthy at departure.
You are 200 ft AGL, climbing at 78 KIAS (Vy, best rate of climb), heading 141°, when the engine begins to run rough. The tachometer is unwinding. Power is noticeably down. Off your left wing, the off-field environment is medium-density development and wooded wetland — not a field you would choose to land in. Off your right wing, the same. The climb is marginal; you are barely above the terrain.
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 the marginal performance of the 172M at this density altitude.
- {'label': 'Field', 'value': 'X39 · Tampa North Aero Park'}
- {'label': 'Runways', 'value': '14/32'}
- {'label': 'Elevation', 'value': '68 ft'}
- {'label': 'Aircraft', 'value': 'C172M'}
- {'label': 'Dominant phase', 'value': 'Takeoff / Landing'}
The decision
Before we get into the decision tree — what do you already know about the C172M's performance and carburetor ice? (Pick all that apply; this records your baseline.)
What the record shows
What the NTSB files show
NTSB ERA09LA379 (2009): A Cessna 172M student pilot on a solo instructional flight experienced engine power loss during the base-to-final turn in the traffic pattern. The ambient conditions were 75°F OAT and 55°F dew point — conducive to serious carburetor icing per the FAA icing probability chart. The pilot made a forced landing in a field. The probable cause was carburetor icing at glide power, with the pilot's failure to apply carburetor heat proactively in conducive conditions.
NTSB DFW05CA237 (2005): A Cessna 172M lost engine power during initial climb due to carburetor icing. The pilot attempted to maneuver to avoid a fence, stalled, and impacted terrain. The probable cause was engine power loss due to carburetor icing in serious icing conditions, with contributing factors including high density altitude and the pilot's failure to maintain airspeed during the maneuver. The pilot did not survive.
NTSB CEN22LA309 (2022): A Cessna 172M experienced engine power loss during cruise flight due to a stuck exhaust valve. The pilot performed a forced landing in a field between corn crops, resulting in substantial fuselage damage. The airplane was recovered; the pilot survived.
NTSB WPR13LA035 (2012): A Cessna 172M on an aerial photography mission experienced a loss of engine power when the pilot applied full throttle during climb. The accident resulted from failure of the throttle control cable outer jacket, which fragmented and prevented proper throttle control. The pilot made a forced landing.
NTSB CHI07LA177 (2007): A Cessna 172M departed approximately 243 pounds over gross weight and out of balance. During initial climb at 100–150 feet AGL, the engine lost power; the aircraft stalled and impacted terrain. The probable cause was improper aircraft weight and balance and failure to maintain airspeed. The pilot did not survive.
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 dominated by loss-of-control inflight and ground events (see field dominant patterns), but these specific NTSB cases 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: the C172M is a marginal climber, especially at gross weight, in heat, or at high density altitude. Carburetor ice in warm, moist conditions is insidious — it builds gradually, the first symptom is roughness and a dropping tachometer, and by the time it is obvious, altitude is low. The fix — full carburetor heat, immediately, at the first sign of roughness in conducive conditions — is simple. The failure is always a delay. And when the engine fails at low altitude, the decision to accept a forced landing in a poor field is better than stalling trying to stretch a glide to the airport.
Key lesson — In warm, moist Florida summer air, the C172M'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 initial climb, the decision window is measured in seconds — not minutes. Off Runway 14 at X39, the off-field environment is medium-density development and wooded wetland — not a suitable forced-landing field. A delayed response means a forced landing in poor terrain, not a field landing. Know the off-field environment before you depart.
Debrief — teaching points
The C172M is a marginal climber — especially at gross weight, in heat, or at high density altitude.
The C172M has a 150-hp Lycoming O-320-E2D. On a Florida summer day with OAT 32°C and density altitude 2,400 ft, the airplane climbs at roughly 300–400 fpm at best. You are barely above the terrain on initial climb. Any loss of power — even partial — is immediately critical. Know the airplane's performance limits before you depart. If the density altitude is high, the field is short, or you are at gross weight, consider a lighter load or a different day.
Carburetor ice forms in conditions you would not expect — and the C172M is particularly vulnerable.
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 Florida summer conditions. The C172M's carbureted O-320 is particularly susceptible. You do not need visible ice, freezing temperatures, or IMC. Warm, moist air at reduced power is the classic carb-ice environment. Apply carburetor heat proactively during the run-up (confirm the expected RPM drop and recovery) and consider its use during climb in visible moisture or high humidity.
The first symptom is subtle — a dropping tachometer and engine roughness.
In a fixed-pitch airplane like the C172M, 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. At 200 ft AGL on initial climb, you have only 20–30 seconds to act.
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.
Know the off-field environment before you depart — it drives your forced-landing options.
Off Runway 14 at X39, the off-field environment is medium-density development and wooded wetland — not a suitable forced-landing field. Off Runway 32, the same. If the engine fails on initial climb, you do not have a good off-field option. This is not hypothetical; it is the USGS NLCD ground cover off each runway end. Know the terrain, the development, the water, and the obstacles before you line up. If the off-field environment is poor and the density altitude is high, consider a different day or a different field.
Built from the real accident record
Scenario built from NTSB ERA09LA379 (2009 C172M carburetor ice on base-to-final), DFW05CA237 (2005 C172M carb ice on initial climb, high density altitude), CEN22LA309 (2022 C172M stuck exhaust valve forced landing), WPR13LA035 (2012 C172M throttle cable failure), and CHI07LA177 (2007 C172M overweight stall on initial climb). Localized to Tampa North Aero Park (X39), a non-towered field in the Tampa Class B environment.
NTSB reports: ERA09LA379 · DFW05CA237 · CEN22LA309 · WPR13LA035 · CHI07LA177
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 Assessment
Relevant FARs: §91.3 · §91.9 · §91.13 · §91.103
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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