Engine Failure on Climb-Out
Carburetor ice or mechanical failure at low altitude — the C172M's marginal climb and Lakeland's off-field environment force an immediate landing decision
The scenario
Departing Lakeland Linder International Airport (KLAL), Lakeland, FL — Runway 10, climbing out on a 090° heading. Field elevation 142 ft MSL. The runway is 8,500 ft of asphalt, plenty of length for a normal departure.
It is a warm, humid Florida morning in late spring: OAT 28°C, dew point 21°C, altimeter 29.94. Scattered clouds at 3,000 ft, light rain shower visible to the northeast. Visibility 10 SM. The conditions are textbook for carburetor icing in a carbureted airplane at reduced power — the FAA icing probability chart marks this as 'serious icing at glide power.'
You are 300 ft AGL, climbing through 78 KIAS (Vy, best rate of climb), heading 090°, when the engine begins to run rough. Power is noticeably down — the tachometer is unwinding. The C172M's 150-hp Lycoming O-320 is already marginal on climb performance at gross weight; any power loss is serious. KLAL's tower is open 24 hours and is aware of your departure. You are in Class D airspace.
Aircraft: Cessna 172M, two occupants (you and one passenger), full fuel, within weight and balance limits. Carbureted Lycoming O-320, fixed-pitch prop, steam panel, fuel selector on BOTH. Nothing was written up; the airplane was airworthy at departure. 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.
Pilot: you — a Private pilot, current, roughly 180 hours total. This is your second flight in the C172M; you are more familiar with the 172N. You did not brief the passenger on the possibility of an emergency landing. The off-field environment off Runway 10's climb-out (heading 090°) is mixed: low-density development, open developed areas (parks/large lots), and some dense development. It is marginal — not ideal, but workable if you act quickly.
- {'label': 'Field', 'value': 'KLAL · Lakeland Linder'}
- {'label': 'Runways', 'value': '5/23 · 10/28'}
- {'label': 'Elevation', 'value': '142 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 engine failure at low altitude? (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. Ambient conditions (75°F OAT, 55°F dew point) were 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 — 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 critical lesson: once committed to a forced landing, fly the airplane at best glide speed (65 KIAS in the C172M) and do not maneuver to avoid obstacles at the cost of 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 due to a stuck exhaust valve. The pilot performed a forced landing in a field between corn crops, resulting in substantial fuselage damage. The lesson: not all engine failures are carburetor ice. Mechanical failures (stuck valves, throttle cable failure, propeller issues) also cause power loss in the C172M.
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 lesson: a pre-takeoff throttle check is essential. Cycle the throttle smoothly through its full range during the run-up and confirm it moves freely and returns to idle.
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 aircraft weight and balance, and the pilot's failure to maintain sufficient airspeed to avoid a stall during takeoff-initial climb. The lesson: weight and balance errors are not academic — they reduce climb performance, increase stall speed, and can be fatal on initial climb.
The real accidents cited above occurred at other airports and in other aircraft — NOT at Lakeland Linder International Airport. KLAL has its own accident history (see field dominant patterns: LOSS_OF_CONTROL_INFLIGHT 23.7%, LOSS_OF_CONTROL_GROUND 19.4%, FORCED_LANDING 17.2%), but these specific NTSB events happened elsewhere. The scenario is localized to KLAL 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 O-320 is marginal on climb, especially at gross weight, in heat, or at high density altitude. Any power loss on initial climb is critical. Carburetor ice is the most common cause in warm, moist conditions; mechanical failures (stuck valves, throttle cable, propeller) are less common but real. The response is always the same: recognize the problem early, apply carb heat if roughness suggests icing, and if power does not return, establish 65 KIAS best glide and prepare for a forced landing. Do not stall trying to stretch the glide to the runway.
Key lesson — The C172M's 150-hp engine is marginal on climb at gross weight. Any power loss on initial climb is critical. Carburetor ice in warm, moist Florida air is the most likely cause of engine roughness at low altitude — apply full carb heat immediately at the first sign of roughness. If power does not restore, establish 65 KIAS best glide and prepare for a forced landing in the best available off-field terrain. Off Runway 10's climb-out, that terrain is mixed (low-density development, parks, some dense development) — marginal but workable. Do not stall trying to turn back to the airport or avoid obstacles. Fly the airplane at best glide speed.
Debrief — teaching points
The C172M's 150-hp engine is marginal on climb, especially at gross weight or high density altitude.
The Cessna 172M is powered by a 150-hp Lycoming O-320 — the lower-powered variant of the 172 family. Climb performance is noticeably reduced compared to the 172N (180 hp) or 172S (180 hp). At gross weight (2,300 lb), in heat, or at high density altitude, the climb rate drops significantly. Any power loss on initial climb is critical — there is little margin. Weight and balance errors make this worse: an overweight or out-of-CG airplane climbs even more poorly and stalls at a higher airspeed. Know your airplane's performance limits and do not depart overweight or out of balance.
Carburetor ice forms in warm, moist air — not just in freezing temperatures.
The FAA icing probability chart shows 'serious icing at glide power' in the temperature range of roughly 20–30°C when relative humidity is high — exactly Florida's warm, moist conditions. The temperature drop across the carburetor venturi can be 20–30°C, easily producing ice even when OAT is well above freezing. The C172M's carbureted O-320 is particularly susceptible. Apply carburetor heat proactively in these conditions — do not wait for the symptom to appear.
The first symptom of carburetor ice 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 300 ft AGL on initial climb, a 200–300 RPM drop is a critical warning.
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 KLAL Runway 10, an engine failure on climb-out is a forced landing in off-field terrain.
The off-field environment off Runway 10's climb-out (heading 090°) is mixed: low-density development, open developed areas (parks/large lots), and some dense development. It is marginal — not ideal, but workable for a forced landing if you act quickly and fly the airplane at best glide speed (65 KIAS). Do not stall trying to turn back to the airport or avoid obstacles. Best glide at 65 KIAS, flaps for slowest possible touchdown speed (impact energy rises with the square of speed), master off just before impact. A controlled forced landing is survivable; a stall/spin is not.
Weight and balance errors reduce climb performance and increase stall speed — they are not academic.
An overweight or out-of-CG aircraft has reduced climb performance, increased stall speed, and longer takeoff roll. The C172M at gross weight is already marginal on climb; add 200+ pounds and the margin disappears. NTSB CHI07LA177 is a fatal reminder: a 243-pound overweight C172M stalled on initial climb at 100–150 ft AGL. Know your airplane's weight and balance limits. Do not depart overweight or out of balance, and do not load the airplane without a current weight-and-balance calculation.
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, stall on avoidance), CEN22LA309 (2022 C172M stuck exhaust valve / forced landing), WPR13LA035 (2012 C172M throttle cable failure / power loss), and CHI07LA177 (2007 C172M overweight / out-of-CG / stall on initial climb). Anonymized and localized to KLAL.
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.II.C — Takeoff and Climb
Relevant FARs: §91.3 · §91.9 · §91.13 · §91.23
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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