
01-10
Del Krantz
- FUNCTION
- Vocals, rhythm guitar
- CERTIFICATE
- A&P · Inspection Authorization
- STATUS
- Still holds his IA. Still current. Still right.
“A chord is either within tolerance or it is not.”

MECHANICAL — BAND MAINTENANCE MANUAL
There is no turbulence. There is only insufficient understanding.
Five certificated persons. One argument about a B-flat. Tuned to A440 because the manual says so.
Mechanical formed in 1989 on the second shift at Meridian Aircraft Service, a general-aviation maintenance operation off Jabara Airport in Wichita. Its members were, by trade, A&P mechanics — people who spent their days inside Cessnas and Bonanzas with the cowlings off. According to the archive, they did not set out to form a band. They set out to identify a vibration. During a compression check in Hangar 4, a Continental engine at run-up produced a low resonant drone. Del Krantz stated, flatly, that it was a B-flat. Roy Vandersloot disagreed. The argument that followed lasted the better part of a week and is described, in the band's own account, as the first rehearsal. They held from the beginning that music and maintenance were the same discipline practiced on different materials: a song, like an airframe, was either within tolerance or it was not.
NOTE“We did not start a band. We started an argument, and the argument had a tempo.” — Del Krantz, on the founding of Mechanical


01-10
“A chord is either within tolerance or it is not.”

01-20
“It was not a B-flat.”

01-30
“Torque”
“To spec.”

01-40
“A metronome is a suggestion. A tach is a fact.”

01-50
“There is turbulence. I have been in it.”
Four records, 1990–1997. Each one released when it was ready and not before.
| REF | YEAR | RECORD | INTERVAL | REMARKS | |
|---|---|---|---|---|---|
| 05-10 | 1990 | Annual | 12 cal mo | Their first record. Named for the inspection, not the calendar. | OPEN → |
| 05-20 | 1992 | Airworthiness Directive | Mandatory | A mandatory record, in their telling. Compliance was not presented as optional. | OPEN → |
| 05-30 | 1994 | Time Between Overhaul | 2,000 hr | The one everyone points to. Also the longest gap they were willing to tolerate. | OPEN → |
| 05-40 | 1997 | Squawk Sheet | Open | A list of everything found wrong, set to music. Their last. | OPEN → |
Three recordings are released for service. Play at full power. Monitor for vibration.
Airworthiness Directive · 1992
Airworthiness Directive · 1992
Squawk Sheet · 1997
Every performance was logged to the tenth of an hour, the way one logs a Hobbs meter. These entries are the ones the archive can verify.
| ENTRY | DATE | LOCATION | SIGNED |
|---|---|---|---|
| 001 | Nov 3, 1990 | Hangar 4, Wichita | D. Krantz, IA |
| 002 | Jun 15, 1991 | Airframe Local 921 Hall, Wichita | D. Krantz, IA |
| 003 | Sep 26, 1992 | The Riveters' Club, Derby | D. Krantz, IA |
| 004 | Mar 19, 1994 | Static Test Facility, unauthorized | D. Krantz, IA |
| 005 | Aug 8, 1995 | Kansas Aviation Expo, one set only | D. Krantz, IA |
| 006 | Feb 14, 1997 | The Pressure Vessel, Wichita | D. Krantz, IA |
| 007 | Oct 30, 1998 | Hangar 4, Wichita | D. Krantz, IA |



20-10
Mechanical came together at Meridian Aircraft Service on the second shift in 1989. All five were certificated mechanics — airframe, powerplant, propeller, avionics, and one IA inspector who outranked the rest and reminded them of it. None of them, by their own account, intended to start a band.
What they intended to do was identify a vibration. A Continental engine at run-up in Hangar 4 produced a low resonant drone. Krantz called it a B-flat. Vandersloot said it was not. The argument ran the better part of a week, and by the end of it Bemis was holding the low end, Pruett had set a tempo against a shop tachometer, and Ostrander had recorded the engine off the test stand — a recording he insists to this day is not a sample but a document.
20-20
Mechanical held that music and maintenance were the same discipline practiced on different materials. A song, like an airframe, was either within tolerance or it was not. They tuned to A440 because the manual said so. They logged every performance to the tenth of an hour, the way one logs a Hobbs meter, and kept the sheets.
They refused to play any room without a concrete floor, for reasons they considered self-evident and declined to explain. Their label, Thrust Reverser Recordings, was named after a jet component by a band that played strictly piston aircraft, and the archive has never established why. Setlists were handed to the sound man as a run-up checklist. Nobody who worked with them found any of this unusual for long.
20-30
Emmett Ostrander was the outlier, and the band never pretended otherwise. He ran the keys, the samples, and the engine recordings — but the real distinction was simpler. He was the only member who left the ground. He held a Private Pilot certificate, and the other four were certificated to fix airplanes, not fly them. In hangar culture that is a real and affectionate divide, and Mechanical lived on the mechanic's side of it.
It sharpened the tagline. "There is no turbulence. There is only insufficient understanding" is a mechanic's line — it denies the subjective. Ostrander is the one man in the band who has actually felt turbulence at altitude, and therefore the only one who knows the line is wrong. He never corrected them.
By 1998 the others had families and other shops, and the band came apart the way an annual inspection ends: quietly, on schedule, everything signed off. Krantz maintains the catalog is airworthy. To date, nobody has produced a squawk.

Discrepancies reported by members of the public, with the corrective action taken. The band considered every one of them closed.
I have seen a lot of bar bands. I have never seen one tune to A440 because "the manual says so" and then log the set to the tenth of an hour. Mechanical played for fifty-one minutes. The drummer did not drift. I checked.
Reported by: Air Capital Sound, Wichita — 1994
Logged. Drift checked against the shop tach. None found.
Signed off
I torque bolts for a living. These men torque a downbeat. I do not know how else to say it. Left mag only, and it still ran clean.
Reported by: A&P mechanic, Jabara Airport
Concur. Mag drop within limits.
Signed off
They played in an actual hangar with an actual Cessna behind them. At one point the low end lined up with an engine running on the test stand and I felt it in my chest. I have described this to people. They do not believe me. The archive does.
Reported by: Attendee, Meridian Aircraft Service — 1996
Noted. The test stand was running. It was supposed to be.
Signed off
The singer kept saying there is no turbulence, only insufficient understanding. I have flown a line of storms over the Flint Hills. There is turbulence. But the keyboard player knew that. He never said anything either.
Reported by: Private pilot, name withheld
Pilot report acknowledged. No further action. See Ostrander.
Signed off
Loud. Precise. Difficult to dance to — though the band would take dancing as evidence the tempo was wrong. I left with a ringing in my ears and an unexpected respect for compression ratios.
Reported by: The Sedgwick Weekly — 1995
Dancing observed at 1:12 into the set. Tempo re-verified. Tempo was correct.
Signed off
Someone in the crowd yelled that the founding vibration was not a B-flat. The lead guitarist stopped, looked directly at him, and said nothing. Best sixty seconds of live music I have witnessed.
Reported by: Show attendee, Wichita — 1992
It was not a B-flat. Closed.
Signed off
Placards are required. Shirts are not. The band recommends both.
