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Community resource. All entries are sourced from official Zenith revision documents, NTSB reports, and builder forums — each with a linked primary source. Always verify with an A&P or EAA Technical Counselor before acting on any information here. Not affiliated with Zenith Aircraft Company.

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Build Errata Wiki

The community archive of known plan inconsistencies, manufacturer updates, and hard-won build wisdom for Zenith CH750 STOL, Cruzer, CH601, and more. Built by builders, for builders.

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51 issues

Zenith BuildersBuild Errata Wiki

Rudder skin P/N 75R2-3 total height listed as 650mm — correct value is 1300mm

Rudder rib P/N 75R1-5 material thickness listed as t=0.016" — correct is t=0.025"

Rudder rigged backward — plans did not make correct control sense explicit enough to prevent fatal accident

Rear channel 6W7-2 height listed as 100mm — correct is 97mm

Elevator horn P/N 75T3-10 bent height listed as 92mm — correct is 68mm

Horizontal stabilizer front bracket spacing incorrect on drawing 75-TA-1

Nosewheel fork requires doubler — advisory applies to CH 650 as well as CH 601 XL

Wing spar P/N 75W2-2 angle cut dimension listed as 40mm — correct is 53mm

Spar root doubler labels transposed on drawing 75-WS-1

Control deflection stops completely missing from Edition 1 drawing 75-Z-1

Gear strut fitting bolt labels transposed on drawing 75-F-14

Rear fuselage bulkhead flanged lightening hole direction reversed on 75F2-3

Rudder mounting hole diameters incorrect in 75F3-1, 75F3-2, and 75R2-4

Seat part 75F13-1 flange shown pointing up in parts detail — correct orientation is flange down/outboard

Jury strut angle (75-WA-3) flange direction shown reversed in drawing

Rear fuselage channel angle 75F3-7 and 75F3-9 listed as 55 degrees — correct is 65 degrees

Cabin side P/N 75F7-9 length listed as 1055mm — correct is 1070mm

Seat structure P/N 75F11-4 dimension errors: top rear 20mm (correct 22mm), bottom right 20mm (correct 16mm)

Elevator pushrod P/N 75C2-7 length listed as 1000mm — correct is 913mm

Rudder controls drawing 75-CA-3 specifies bolt AN3-16A for 75C3-7 — correct bolt is AN3-5A

Cabin frame drawing 75-F-15 contains multiple major dimension errors

Gross weight upgrade (1320 to 1440 lbs): structural parts may not be present in early kits

Flaperon nose rib holes do not align with pre-drilled holes in flaperon skins

Wing root rear doubler position unclear — 75W3-4 and 75W1-2K placement generated significant builder confusion

Wing incidence setting (3 degrees nose up) not clearly described — common builder confusion

Cabin frame gusset C75N1-2 — plans do not clearly indicate front vs rear face installation

Rudder pedal safety alert: incorrect material thickness, serial numbers 75-8563 to 75-8950

Elevator hinge pin advisory — CH 601 series (May 2003)

Nosewheel fork requires doubler — advisory issued December 2004

Rudder pedal safety alert: incorrect material thickness, serial numbers 65-8563 to 65-8950

Rotax 912 bed mount steel bracket E1-1X — check for cracks (June 2010)

Horizontal stabilizer mandatory inspection — all CH 601 XL and CH 650 (January 2017)

Aileron drawing 6-W-2: outboard arrow labeled wrong, angle listed as 77 degrees (correct: 75.68 degrees)

Wing root rear skin trimming dimensions wrong: 6-W-9 shows 908mm/65mm, correct is 895mm/60mm

Fuselage top skin 6B21-1 and 6B21-2 material thickness listed as .035" — correct is .058"

Control cable fairlead drawing 6-B-22: "Upper Elevator" and "Left Rudder" labels reversed

Firewall riveting drawing 6-B-7: rivet pitch listed as 40 — correct is A5 PITCH 30

Rear fuselage angle 6-B-4: diagonal L angle bend direction ambiguous, must be bend toward top

Rudder pedal cable attachment plate 6B9-1 thickness listed as .050" — correct is .080"

Stabilizer front spar riveting: first rivet positions wrong, rear spar first rivet also wrong

Stabilizer attachment drawing 6-T-2: FRWD arrow wrong, doublers shown on wrong (rear) face of spar

Elevator deflection template dimension 6-S-4: listed as 440mm — correct is 367mm

Canopy gas spring quantity on drawing 6-C-2 listed as 10 — correct quantity is 2

CRITICAL: Wing flutter causing in-flight structural breakup — 6+ fatal crashes, mandatory structural upgrade required

Incorrect hardware in control yoke assembly caused fatal accident (N2992W, Cincinnati OH, Sep 2022)

SD revision summary contradicts drawing on rivet spec: SD75-FR-03 says A4→A5, but drawing shows A4

Trim tab connecting rod SD75-HE-04 specified at 148mm — correct length is 158mm

Revision summary document references wrong drawing numbers for firewall stiffener and doubler

Drawing list SD75-GG-01 revised without updating revision date — no way to know if you have current version

5th Edition Cruzer plans missing all fuselage parts detail pages — 4th Edition required alongside 5th

CH 650 builders using CH 601 XL assembly photo guides must exclude specific sections — not clearly flagged in plans

Zenith Builders
Build Errata Wiki