Engine Failure on the Climb-Out
Carburetor ice, dense development, and a forced-landing decision in a 172M with marginal climb performance
The scenario
Departing Tampa International Airport (KTPA), Tampa, FL — Runway 10, climbing out on a 092° heading. Elevation 26 ft MSL; the field is essentially at sea level but surrounded by dense development, medium development, parks, and open lots.
It is a warm, humid Florida afternoon in late spring: OAT 28°C, dew point 21°C, altimeter 29.92. Scattered clouds at 2,500 ft. Visibility 10 SM. This is classic Gulf Coast icing weather — warm, moist air, and exactly the environment the FAA icing probability chart marks 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. You did not apply it after takeoff because you were focused on the climb.
You are 450 ft AGL, climbing through 78 KIAS (Vy, best rate of climb), heading 092°, when the engine begins to run rough. Power is noticeably down — the tachometer is dropping. The Lycoming O-320 in this 172M is only 150 hp; climb performance is marginal at gross weight, in heat, and at sea-level density altitude. The loss of even 50 hp is significant. KTPA is Class B airspace, 24-hour tower, and you are in radio contact. The airport is behind you. Dense development surrounds the departure path.
Aircraft: Cessna 172M, solo, full fuel, within limits. Carbureted Lycoming O-320-E2D, 150 hp, fixed-pitch prop, steam panel (vacuum-driven attitude and heading indicators), fuel selector on BOTH. Nothing was written up; the airplane was airworthy at departure.
Pilot: you — a Private pilot, current, roughly 200 hours total. You are familiar with KTPA from training flights, but this is your first solo cross-country departure. You did not apply carburetor heat proactively because you were not thinking about icing in 28°C air. You are now at 450 ft AGL with a rough engine and dense development in all directions.
- {'label': 'Field', 'value': 'KTPA · Tampa'}
- {'label': 'Runways', 'value': '10/28 · 19L/01R · 19R/01L'}
- {'label': 'Elevation', 'value': '26 ft'}
- {'label': 'Aircraft', 'value': 'C172M'}
- {'label': 'Dominant phase', 'value': 'Landing / Takeoff'}
The decision
Before we get into the decision tree — what do you already know about the C172M's climb performance and carburetor icing? (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 at an unspecified airport. 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 partial loss of engine power for undetermined reasons, but the conditions and symptoms are consistent with carburetor ice.
NTSB DFW05CA237 (2005): A Cessna 172M lost engine power during initial climb due to carburetor icing and made a forced landing in a field. The pilot stalled while maneuvering to avoid a fence — a common trap in forced landings when the pilot tries to stretch the glide to a 'better' spot and loses airspeed. Contributing factors included high density altitude, which reduced the airplane's already marginal climb performance.
NTSB CEN22LA309 (2022): A Cessna 172M experienced engine power loss during cruise flight near Friend, Nebraska due to a stuck exhaust valve. The pilot performed a forced landing in a field between corn crops, resulting in substantial fuselage damage. This case illustrates that forced-landing decisions are not always about icing — mechanical failures (stuck valves, throttle cable failure, etc.) also force the decision.
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 had to execute a forced landing.
NTSB CHI07LA177 (2007): A Cessna 172M departed approximately 243 pounds over gross weight and out of balance. During initial climb, the engine lost power at 100–150 feet AGL; the aircraft stalled and impacted terrain. The probable cause was improper weight and balance and failure to maintain sufficient airspeed to avoid a stall during takeoff-initial climb. This case underscores the C172M's marginal climb performance at gross weight — even a small loss of power or a momentary loss of airspeed can be catastrophic.
The real accidents cited above occurred at other airports and in other aircraft — NOT at Tampa International Airport. KTPA has its own accident history (see field dominant patterns: 22.2% forced landings, 11.1% loss of control in flight), but these specific events happened elsewhere. The scenario is localized to KTPA to make the off-field environment real and consequential for you as a student here.
The consistent thread across all these events: the C172M's 150 hp Lycoming O-320 is marginal on climb, especially at gross weight, in heat, or at high density altitude. A loss of even 50 hp — whether from carburetor ice, a stuck valve, a throttle cable failure, or overweight — is a serious problem. Early recognition of engine degradation and immediate action (carb heat, or a turn back to the airport) is the difference between a clean departure and a forced landing. And if a forced landing becomes necessary, the decision to land in the best available spot (a park or open lot, not dense development) and to maintain best glide speed (65 KIAS) throughout is the difference between a survivable accident and a fatal one.
At KTPA, the off-field environment off Runway 10's departure end is dense development, parks, and wooded wetland — all marginal landing spots. A forced landing there is difficult and hazardous. The decision to turn back to the airport at the first sign of engine trouble is the correct one — and it requires altitude, which you must preserve by flying best glide speed (65 KIAS) and not stalling while maneuvering.
Key lesson — In warm, moist Gulf Coast 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 over dense development, the decision window is measured in seconds — not minutes. Off Runway 10 at KTPA, the off-field environment is dense development and parks: a delayed response means a forced landing in a difficult spot, not a return to the airport. The C172M's marginal climb performance at gross weight means that a loss of even 50 hp is critical. Preserve altitude, fly best glide speed (65 KIAS), and make the turn back to the airport early.
Debrief — teaching points
The C172M's 150 hp Lycoming O-320 is marginal on climb, especially at gross weight and in heat.
The C172M is the lower-powered variant of the 172 family. At gross weight, in warm air, at sea-level density altitude, or on a humid day, climb performance is noticeably reduced. A loss of even 50 hp — whether from carburetor ice, a mechanical failure, or overweight — is a serious problem. You cannot afford to ignore engine roughness or a dropping tachometer in a 172M at low altitude. Early recognition and immediate action are critical.
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 C172M'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 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.
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 KTPA Runway 10, an engine failure on departure is a forced landing in dense development.
The off-field environment off Runway 10's departure end (heading 092°) is dense development, parks, and wooded wetland. There is no alternate landing surface — no open field, no road, no clear area. If the engine quits on the Runway 10 departure and altitude is insufficient to return to the airport, the outcome is a forced landing in a difficult spot. This is not a worst-case scenario; it is the geographic reality. Best glide is 65 KIAS. Doors unlatched before impact. Master off just before touchdown. 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 10.
Preserve altitude by flying best glide speed (65 KIAS) and turning back to the airport early.
At 450 ft AGL with a rough engine, you have a narrow window to turn back to the airport. The 'impossible turn' is a real risk at low altitude in a marginal-climb airplane. The key is to fly best glide speed (65 KIAS) — not a higher speed that burns altitude faster — and to make the turn decision early, before you are below 400 ft AGL. Do not try to stretch the glide to a 'better' landing spot; the best spot is the runway behind you. Fly the turn at 65 KIAS, maintain control authority, and get back to the airport.
Built from the real accident record
Scenario built from NTSB ERA09LA379 (2009 C172M carburetor ice / forced landing), DFW05CA237 (2005 C172M carb ice + stall during forced landing), CEN22LA309 (2022 C172M stuck valve / forced landing), WPR13LA035 (2012 C172M throttle cable failure / forced landing), and CHI07LA177 (2007 C172M overweight / stall on climb-out). Localized to Tampa International Airport (KTPA).
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 Inspection
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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