Rough Climb Over Clearwater
Carburetor ice, partial power loss, and a low-altitude decision over dense development — the Warrior's fuel selector adds a complication
The scenario
Departing Clearwater Air Park (KCLW), Clearwater, FL — Runway 16, climbing out on a 155° heading. Elevation 71 ft MSL. You are a Private pilot with roughly 180 hours total, current, and this is a local VFR flight in a Piper PA-28-161 Warrior.
It is a hazy Florida afternoon in late spring: OAT 27°C, dew point 21°C, altimeter 29.93. Scattered clouds at 2,800 ft, light rain shower one mile to the northeast. Visibility 7 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 Lycoming O-320 in the Warrior is carbureted; it has no fuel injection and no alternate air system. Carburetor heat is your only tool.
You are 350 ft AGL, climbing through 79 KIAS (Vy, best rate of climb), heading 155°, when the engine begins to run rough. Power is noticeably down — the tachometer is dropping. The off-field environment below is dense development: low-density and medium-density residential, with scattered parks and open lots. There is no open field, no water, no obvious landing surface. KCLW is non-towered (CTAF); you are in Class G airspace, but the overlying Tampa Class B begins at 3,000 ft MSL.
Aircraft: Piper PA-28-161 Warrior, solo, full fuel (48 gallons usable), within limits. Fuel selector is on LEFT tank (you switched to LEFT at 10 minutes of flight time per your fuel plan). Nothing was written up; the airplane was airworthy at departure.
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 heads-down on the climb and the engine sounded fine at 79 KIAS. You are now at 350 ft AGL with a rough engine and no obvious landing surface below.
- {'label': 'Field', 'value': 'KCLW · Clearwater Air Park'}
- {'label': 'Runways', 'value': '16/34'}
- {'label': 'Elevation', 'value': '71 ft'}
- {'label': 'Aircraft', 'value': 'PA-28-161'}
- {'label': 'Dominant phase', 'value': 'Landing / Approach'}
The decision
Before we get into the decision tree — what do you already know about carburetor ice in the Piper 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 encountered progressive engine power loss due to carburetor icing during climb through 6,500 feet. A contributing factor was limited carburetor heat valve travel from recent maintenance — the carb heat system was not delivering full heat. The probable cause was carburetor icing in conditions conducive to serious icing.
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.
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 probable cause was 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 probable cause was the pilot's improper use of carburetor heat, which failed to remove accumulated ice.
The local environment at KCLW makes this scenario particularly unforgiving: Runway 16's departure end is dense development — low-density and medium-density residential, with scattered parks and open lots. An engine failure on the Runway 16 departure at low altitude is a forced landing into that development, not a field landing. There is no open field, no water, no road. The houses and trees are the off-field environment. This is not hypothetical; it is the NLCD ground cover off that runway end.
The real accidents cited above occurred at other airports and in other aircraft — NOT at Clearwater Air Park. KCLW has its own accident history (see field dominant patterns: forced landings 22.2%, loss of control 18.5%, gear-up landings 18.5%), but these specific carburetor ice events happened elsewhere. The scenario is localized to KCLW 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. And the Warrior's LEFT / RIGHT fuel selector (no BOTH position) adds a complication: a pilot who misdiagnoses carb ice as a fuel starvation problem and switches tanks can mask the real issue and waste critical altitude.
Key lesson — In warm, moist Gulf Coast air, the PA-28-161'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 16 at KCLW, the off-field environment is dense residential development: a delayed response means a forced landing into houses and trees, not a field landing. Know your fuel selector position and do not confuse carb ice with fuel starvation — they have different fixes.
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 KCLW. You do not need visible ice, freezing temperatures, or IMC. Warm, moist air at reduced power is the classic carb-ice environment. The Lycoming O-320 in the Warrior is carbureted; it has no fuel injection and no alternate air system. Carburetor heat is the only tool. Proactive carb heat use in conducive conditions is not optional — apply it during the run-up check (and confirm the expected RPM drop, then 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 Warrior, 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 350 ft AGL over dense development, a 30-second delay in recognizing the symptom can be the difference between a clean recovery and a forced landing.
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. Full on or off — there is no middle ground.
At KCLW Runway 16, an engine failure on departure is a forced landing into dense development.
The off-field environment off Runway 16's departure end (heading 155°) is dense residential development with scattered parks and open lots. There is no alternate landing surface. If the engine quits on the Runway 16 departure and altitude is insufficient to return to the airport, the outcome is a forced landing into that development. This is not a worst-case scenario; it is the geographic reality. Best glide is 73 KIAS. Flaps for slowest possible touchdown speed — impact energy rises with the square of touchdown speed, so the slowest possible speed matters most. Scan for the least-obstructed surface (a park, a large parking lot) and commit to it. Know this before you line up on Runway 16.
The Warrior's LEFT / RIGHT fuel selector (no BOTH position) adds a complication.
The PA-28-161 has a LEFT / RIGHT fuel selector with no BOTH position — tank management is the pilot's job. Fuel starvation from not switching tanks at planned intervals is a Warrior-class accident. But this also means: if the engine runs rough and you switch tanks trying to diagnose a fuel problem, you can mask carburetor ice as a fuel starvation issue and waste critical altitude. Know your fuel plan in advance (e.g., switch to RIGHT at +1 hour, switch back to LEFT at +3 hours). When power loss occurs at low altitude, immediately apply carburetor heat before switching tanks. Carb ice and fuel starvation have different fixes; do not confuse them.
A precautionary landing after an engine anomaly is not failure — it is airmanship.
An engine anomaly at low altitude over development, even one that resolves with carburetor heat, warrants a precautionary landing and a maintenance inspection before continuing. The airplane may be fine, but the mechanic's inspection is not optional — it is the correct next step after any in-flight engine anomaly. NTSB CEN12LA175 found that limited carburetor heat valve travel from recent maintenance was a contributing factor to a PA-28-161 carb ice accident. A precautionary landing and inspection can catch maintenance issues before they become fatal.
At low altitude with partial power, a straight-in approach is better than a full pattern.
At 300–400 ft AGL with a partially degraded engine, a full pattern is a luxury you may not have. The correct execution of a partial-power emergency at low altitude near an airport is a straight-in or modified approach — the shortest path to the runway, flown at best glide speed (73 KIAS), with CTAF traffic advised. Advise traffic of the emergency, request a straight-in, and fly directly to the runway. Add flaps as the runway is made. This is the correct decision: shortest path, communicate, fly the airplane.
Built from the real accident record
Scenario built from NTSB CEN12LA175 (2012 PA-28-161 carburetor ice / limited carb heat travel), 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), NYC03LA012 (2002 PA-28-161 improper carb heat use), and fuel-management precedents WPR24LA167, GAA19CA534, WPR12LA023. Anonymized and localized to KCLW.
NTSB reports: CEN12LA175 · LAX03LA238 · CEN09CA532 · ATL04LA124 · NYC03LA012 · WPR24LA167 · GAA19CA534 · WPR12LA023
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 — Flight Controls · PA.III.B — Takeoff and Climb Performance
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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