BROUGHT TO YOU BY FLYING FINANCE
So, you’ve decided you’re ready to buy an aircraft, and you’re in the used market. You pull up Aircraft For Sale, and suddenly you’re staring at a wall of abbreviations, numbers, and jargon that you’re expected to understand intimately. TTAF 3,200. SMOH 840. NDH. “Full IFR.” Fresh annual.
What should make you lean in, and what should make you run?
Whether you’re a first-time buyer or just getting back into the market after a few years away, learning to read between the lines of an aircraft listing is one of the most valuable skills you can develop. It costs nothing, it takes minutes, and it can save you thousands.
Every listing leads with time—and for good reason. The hours on an airframe and engine are the single biggest indicators of what you’re actually buying.
Total Time Acronyms
TTAF (Total Time Airframe) tells you how many hours the airplane has been in the air since it rolled out of the factory. That number only goes up. No amount of maintenance resets it. A 1975 Cessna 182 with 2,800 hours has lived a different life than one with 8,500 hours, even if they look similar in photos.
Then there’s the engine time, and this is where a lot of sellers like to get creative.
SMOH (Since Major Overhaul) is the gold standard. It means the engine was fully disassembled, inspected, and rebuilt to manufacturer specifications by a qualified shop. But asthe Aircraft Owners and Pilots Association (AOPA) has cautioned, not all overhaul-related abbreviations are created equal.
STOH (Since Top Overhaul) means only the cylinders were addressed, not the bottom end. TSOH (Total Time Since Overhaul) is vague enough that it could refer to either. And SFRM (Since Factory Remanufacture) is actually better than SMOH, as it means the engine was rebuilt to factory-new tolerances and issued a zero-time logbook.
The difference matters enormously. An engine listed as SFRM essentially resets the clock entirely, while a field overhaul performed by a private shop can be a very different proposition with different standards, even if both technically qualify as “overhauled.” Always ask the seller who did the work, when it was done, and to what standard.
SPOH (Since Propeller Overhaul) is the third time figure to watch. Props have their own recommended overhaul intervals, and a prop that’s due can cost $3,000 to $10,000 depending on type. If the listing doesn’t mention prop time at all, ask. Silence on this point is rarely a good sign.
Damage History Acronyms
Three letters carry enormous weight: NDH (No Damage History). This means the aircraft has no record of damage on file with the FAA. It’s a strong selling point, and reputable sellers will often put it front and center.
Watch for the subtler cousin: NMDH (No Major Damage History). That qualifier means something happened (anything from a gear-up landing to a hangar rash incident or a ground strike), it just wasn’t classified as major. Those incidents don’t necessarily disqualify an aircraft, but an NMDH label does mean you need to dig deeper.
You can verify damage and accident history yourself. The FAA Registry lets you look up any N-number to confirm registration status and ownership. The National Transportation Safety Board (NTSB) Aviation Accident Database will show you whether the tail number has been involved in any reported incidents.
Services like Aircraft Title & Escrow can pull a comprehensive title search that reveals liens, previous owners, and damage records that might not show up in a standard listing. Damage history can significantly affect value, and the nature and quality of the repair matter just as much as the event itself.
Read What’s Not in the Listing
The most revealing part of many aircraft ads is what the seller chose to leave out. Experienced buyers on forums like Pilots of America have cataloged the red flags over the years, and a few patterns emerge consistently.
“Call for price” is the big one. In most listing search engines, no price means the ad won’t appear in filtered results, which means serious, comparison-shopping buyers never see it. Sellers who withhold the price are often testing the market, fishing for offers above fair value, or trying to control the conversation before you have context. It’s not an automatic deal-breaker, but you should probably approach with your guard up.
Missing avionics details should raise an eyebrow. If the seller lists “full IFR” but doesn’t name specific equipment, that panel could contain anything from a modern Garmin G500 suite to a collection of 1980s King radios with a single CDI. The avionics package can easily represent 20 to 30 percent of a piston single’s value, so vagueness here is probably left intentionally for the seller’s benefit.
Photo quality tells a story too. Aircraft For Sale prioritizes reputable listings, but some independent marketplaces have less stringent quality control on what gets posted. Dark, blurry photos taken inside a closed hangar or shots where the aircraft is only partially in frame can mean the seller doesn’t want you to look too closely. Detail-oriented sellers will take detail-oriented photos of the whole vehicle in good lighting. Don’t be afraid to ask for better images if there are any missing angles.
Understand Maintenance Program Language
For turbine aircraft and higher-end pistons, listings often reference maintenance programs by acronym: ESP (Engine Service Plan), MSP (Maintenance Service Plan), CAMP (a maintenance tracking platform), JSSI (Jet Support Services Inc.), and others.
There’s a critical difference between an engine being enrolled in a program versus merely being eligible for one. Enrolled means someone has been paying into a maintenance plan that covers future events. Eligible just means the program would accept the engine, but you’d be starting from scratch, often with a hefty buy-in.
For piston buyers, look for how the seller describes the most recent annual inspection. The word “fresh” gets thrown around loosely. A truly thorough recent annual by a reputable shop is a legitimate selling point. “Fresh annual” from the seller’s own mechanic, performed right before listing, sometimes means the bare minimum was done to make the airplane legal for sale. Check the last three annuals to see whether the maintenance has been consistent or whether the recent one was a suspiciously light cleanup job.
Do Your Homework Before You Call
The best thing about learning to read listings critically is that it’s free due diligence. Before you ever pick up the phone, you can cross-reference the asking price against valuation tools like Vref or the Aircraft Bluebook, look up the tail number on the FAA registry, search the NTSB database, and check type-club forums for known issues with that specific model or serial number range.
A listing is a sales pitch. Your job is to read it like a detective and ask the right follow-up questions. Do that well, and by the time you show up for the pre-buy inspection, you’ll already know most of what you need to.
Talk to our staff at FLYING Finance today and we can help walk through the buying process.