STABILIZER JACKSCREW ACCESS COVER
Cessna 185 Skywagon · Weight And Balance
Overview
This document provides installation instructions for the Stabilizer Jackscrew Access Cover for the Cessna 180, 185, and A185 models. It details the necessary parts, tools, and steps required to successfully install the access cover, which facilitates maintenance access to the stabilizer jackscrews. The document is intended for maintenance personnel and pilots who are involved in the upkeep of these aircraft models. It includes specific measurements, part numbers, and installation procedures to ensure proper installation and compliance with safety standards.
- Weight increase of 0.2 pounds after installation.
- Arm measurement of 212.2 inches for weight and balance calculations.
- Resultant moment of 42.4 pound-inches.
- Installation requires elevating the tailcone and cutting a rectangular hole in the aft tailcone skin.
- Specific part numbers for installation include AN525-10R8 screws and MS20470AD4-5 rivets.
Document
Source
Originally published by backcountrypilot.org. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Weight And Balance
- Year
- 1981
- Pages
- 5
- File size
- 187 KB
- Publisher
- backcountrypilot.org
Common. Rarer than 17% of the aircraft models we track.
Most owners only have the POH. Here's the essential set for the Cessna 185 Skywagon.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins
- Type Certificate (TCDS)
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In this document
Installation Overview
The installation of the Stabilizer Jackscrew Access Cover involves elevating the tailcone of the aircraft and cutting a rectangular hole in the aft tailcone skin. This allows for easier access to the jackscrews. The installation requires specific tools and parts, including a doubler assembly and cover plate.
Parts List
The document lists the required parts for the installation, including screws, rivets, and the access cover itself. For example, it specifies 6 screws (AN525-10R8), 5 rivets (MS20470AD4-5), and 1 cover (0712083-3) among others.
Installation Steps
The installation process includes several steps such as elevating the tailcone, drilling out existing rivets, positioning the doubler assembly, and securing it with rivets. The cover must be installed with screws, and the outer surface should be painted to match the aircraft's color.
Weight and Balance Impact
The installation results in a weight increase of 0.2 pounds, with an arm of 212.2 inches, leading to a resultant moment of 42.4 pound-inches.
Safety Notes
Care should be taken to prevent damage to the bulkhead when elevating the tailcone. Additionally, it may be necessary to detach actuator assemblies to provide adequate access during installation.
Safety notes
- Prevent damage to the bulkhead when elevating the tailcone.
- Detach actuator assemblies if necessary for access.
Full document text
Title STABILIZER JACKSCREW ACCESS COVER SK185-27 MAY 4, 1981 ~ Cessna® MODELS AFFECTED 180 185 & A185 PARTS LIST: QUANTITY 6 5 13 2 1 1 1 CHANGE IN WEIGHT AND BALANCE: WEIGHT INCREASE ARM RESULTANT MOMENT INDEX PART NUMBER AN525-10R8 MS20470AD4-5 MS20470AD4-6 MS20470AD4-7 0712083-3 0712083-1 0. 2 pounds 212. 2 inches 42. 4 pound- inches 0.042 1. DESCRIPTION OF INSTALLATION. a. Installation of this kit consists of: (1) Elevating tailcone of aircraft. SERIALS AFFECTED 30000 thru 18053202 185-0001 thru 18504328 NOMENCLATURE Screw Rivet Rivet Rivet Cover Doubler Assy Installation Instructions (NET CHANGE) (2) Locating and cutting rectangular hole in aft tailcone skin for easy access to jackscrews. (3) Installing doubler assembly and access cover plate. 2. INSTALLATION INSTRUCTIONS. a. (Refer to figure 2.) Stabilizer Jackscrew Access Cover Installation. (1) Elevate tailcone of aircraft with hoist and strap or place on a stand approximately at station 172.00, to a sufficient height to allow adequate working freedom. [~~ut(~:N1 If placed on a stand, care should be utilized to prevent dam- age to the bulkhead resting on the stand. (2) Locate area to be modified and drill out existing rivets (14) common to bulkhead (2) at station 215. 687 and the inboard two brackets (5), per sheet 2 of 2. (3) Obtain doubler assembly (15) from the kit and locate it inverted on skin (3) correctly positioned and cleco in place utilizing the hole (14) existing on centerline of station 215. 687 bulkhead (2). 1 of 5 SK185-27 Line up the forward . 098 pilot hole (18) on centerline of doubler assy (15) with the center line of the aircraft and drill thru skin (3). Insert cleco. (4) With doubler assy (15) in place, scribe or mark on the skin (3) the two. 193 attach holes (17) lo- cated on centerline utilized to secure to cover (6). (5) Remove clecos and doubler assembly (15) from belly skin. Drill the two. 193 holes (17) pre- viously marked. (6) Obtain cover (6) from the kit and locate in the correct position on skin (3) and cleco in place utilizing the two previously drilled. 193 holes (17). NOTE Cover (6) is not symmetrical forward and aft. (7) With the cover (6) in place, scribe or mark on skin (3) the outside perimeter of the cover (6). Remove clecos and cover from skin. (B) Cut the rectangular hole in the skin (3) per previously scribed outline. Discard removed material. Check fit of cover (6) with opening in skin (3). NOTE It may be necessary to detach actuator assemblies or some equip- ment to provide access to insert doubler assembly thru hole. (9) Drill out remaining rivets. Insert doubler (15) through hole and cleco in place. Back drill the remaining . 128 holes. A hole finder may be utilized to locate and drill the four holes (18) along the forward edge of the doubler. (10) Locate and drill two. 128 holes (19), . 63 on either side of centerline, through skin (3), doubler (15), and bulkhead (2). (11) Rivet the doubler assembly (15) in place using the appropriate sized rivets as shown on sheet 2 of 2. NOTE Reinstall actuators (8) or any other equipment which may have been removed or disconnected to provide access to area being modified. (12) Install cover (6) with screws (7). (13) Paint the outside surface of the cover (6) to match existing color combination as required. (14) Remove tailcone of aircraft from stand or hoist. 2 SK185-27 REFER TO FIGURE 2 -SHEETS 1 & 2 -----~ (STABILIZER JACKSCREW ACCESS COVER INSTL.) ~ ! \ ::::.:.·:.. = )·!··.~~·..... Figure 1. Stabilizer Jackscrew Access Cover Installation. 3 FWD 0 STABILIZER TRIM CHAIN (REF) CD 0712500 ACTUATOR ASSEMBLY (REF) G)AN525-10R8 SCREW 6REQD r.~~, •'t~l 'I o., " I 'I I :: j co'' i ::J o:: I -: . ~-=1~} i 0 I SK185-27 G) 0712040 BULKHEAD ASSEMBLY (REF) 0 0712217 BULKHEAD ASSEMBLY (REF) 0712045 AFT TAILCONE SKIN (REF) 0712218 TAILGEAR BRACKET ASSEMBLY (REF) 0 0712317 BRACKET (REF) 0712083-3 COVER (REF) Figure 2. Stabilizer Jackscrew Access Cover Installation - Sheet 1 of 2. 4 SK185-27 CD 0712045 AFT TAILCONE SKIN (REF) 16) # 30 {. 128) HOLES 6 EACH (EXISTING IN 0712317 & 0712045) (BACK DRILL THRU 0712083 DOUBLER) MS20470AD4-6 RIVET 6 REQD ® #40 (. 098) PILOT HOLES 5 EACH PER 0712083 (BACK DRILL TO# 30 (. 128) HOLE 5 REQD) MS20470AD4- 5 RIVET 5 REQD ® .193 ATTACH HOLES ·· (REF) 'i ,! +'} -- ·~ I .£:=-fc-c'>_ - .. --~~---t- .---·=~.-c. 't. I I . ' ---~ - + ~=l : \i+ tJ+-~. f · I + ~.· ····~~·· ~~J' (1)0712040 BUL J] -· ·=~...:-· 1 ''lY.j REF) · I ASSEMBLY (KHEAD_/~. CD 0712317 BRACKET (REF) 0 0712217 BULKHEAD ASSEMBLY (REF) VIEW A-A #30 (. 128) HOLE 2 EACH EXISTING IN 0712217, 0712317 & 0712045 (BACK DRILL THRU 0712083 DOUBLER) MS20470AD4-7 RIVET 2 REQD ®0712083-3 COVER 1 REQD #30 (. 128) HOLE 3 EACH EXISTING IN 0712217 & 0712045 (BACK DRILL THRU 0712083 DOUBLER) MS20470AD4-6 RIVET 3 REQD # 30 (. 128) HOLE MS20470AD4-6 RIVET 2 EACH ® 0712083-1 DOUBLER ASSEMBLY 1 REQD Figure 2. Stabilizer Jackscrew Access Cover Installation - Sheet 2 of 2. 5