# STC SA371NW - Type: Supplemental type certificate - Status: Current, Issued - Holder: Martin Hugh Ryan, United States - Description: Removal of right front door. - Applied: October 12, 1976 - Status date: October 28, 1976 - Product: Aircraft, Small Airplane - Certification basis: Part 21 - Data sheets: [TCDS 3A23](https://openairdocs.org/tcds/3A23) - Certificate PDF: https://openairdocs.org/files/sha256/94/84/9484e33a141438507adca4516c5f38de7cdd46cf1bda893e536f5c55f0e7ada2 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/17A01D5850D6858E86257AC3007162E2.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA371NW ## ADs that name it (0) None. ## Approved models (1) - Maule Aerospace Technology Inc. M-4 ([TCDS 3A23](https://openairdocs.org/tcds/3A23)) ## What the certificate says Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record. L _. tlnirrd ;~lJtrBofI1mmcaBcpJrtITI.:nror'V:l'ansportation--j'cdcl'al91lialion911ministl'ation ~upplcmrntGl1[~pc([ertificotc SA371NW 3 all'.' ci vi 1 Ai l' /' '" r" /' . f/j"~y/nal;7:.d:'U'I--.-'iI'''' u"',./0<-'-JI.../ lun4,,,-, j(.,.(,. 3A23 ~Iaul" ~1-4 Removal of right front door. -L;ni/"<~~'J,J''')lr/6~'JU;:h''.n.J: Thi fi modification is considered inadequate for duplication on othcr aircraft. This approval is liml ted to "Iaule M-4. Serial Number 5 only. A eopy of this Certificate and Addendum No. SA371NII' shall be maintained as p"rt of the permane:1t records for the modi fied airer"ft. ; . .J.'!? __/".1.:11'';''': Octobcl' 28, ]976 Acting CI~~~JlCCJi!!l'" and ~la~L:lCttU~j~J"U'_atlch ( 11110 A!!r /lilt/a/II'!; tlO,lJ a!ll/H"olf' i, 111I/IHhllbll' h' " Iltlt' of lOuf (\.-<('dl"I.~ .( ',(}(}{), (II ;fII/lrtJMlII/O/t flol ( .•.(urim.!; :; l't'flfJ. or both. "/ h~l (OII/j(rll' "j.~"b.' UtUuJal,J ill (J{(,,,Jrl1l!t :{':t,~ ":.(1: '!(,17. 'A" r•...•••r.IIO-211 v-cal ., '!1nllrd~totcs or<1mcr1ca Bcpartmcntof'OI:ral1sportatiol1-federal2'(llialion2ldmil1istratiol1 ~uppkmentQt7tgpeQ:erriftcute([Ontinllation~hcct) SA371NW SUPPLEMENTAL TYPE CERTIFICATE ADDENDUM NO. SA371NW The condibons and. limitations of Type Certificate Data Sheet Number 31.23 apply except where superscdcd by the following: This Supplemental Type Certificate Data Sheet, which is part of STC SA371NW prescribes the conditions and limi tab ons under which the product for which the STC was issued meets the ai"'lOrthiness requirements of the Fcderal Aviation Regulations. SUPPU:MENTAL TYPE CERTIFICATE HOLDER: MARTIN HUGH HYAN I.. MAULE ~IODEL. ~l-~ (LAND PLANE - NOR>IAL CATEGORY) AS 1-IODIFIED BY STC SA37.lNW ~ Serial Number Eligible: Airspeed Limits: Maximwn Weight: Instrument Narkings: Placard: Serial Number 5 only Nevel' Exceed - 162 mph (141K) Maximum Structural Cruising - 131 mph (l1~K) Maneuvering - 112 mph (97K) Flaps Extended - 81 mph (70K) Same as specified in Data Sheet 31.23 except that only the pilot and co--pilot scats can be occupied during door-off operation. No other passcngcl's arc allowed. Same as specified ln the Data Sheet 3A23. Locate the following placard adjacent to the ~i.rspecd indicator: WilEN OPEjtATING WITH RIGHT FRONT DOOH HEMOVED: **1. ONLY PILOT AND CO--PILOT SEATS CAN BE OCCUPIED.** **NO OTHER PASSENGERS ALLOWED.** 2. AIHSPr~ED LIMITS: . NEVEl! IeXCEED - 162 mph MAXHIUM STRlJCTUl\AL - 131 mph ~IANEUVEHING SPEED 112 mph FLAPS EXTENDED - 81 ml,h - END - FAA FOfl.M tH1Q-Z-1 (lOG') Tliil ctrlijcat: ml1)' heCTlHlJj(fItJ in