Aerospace Documentation¶

Aerospace documentation meets the highest standards for safety and precision. From maintenance manuals to flight operations, these documents must be accurate, clear, and compliant with stringent regulatory requirements.

Regulatory Framework¶

Governing Bodies¶

United States: - FAA (Federal Aviation Administration) - DOD (Department of Defense)

International: - EASA (European Union Aviation Safety Agency) - ICAO (International Civil Aviation Organization) - National aviation authorities

Key Regulations¶

14 CFR Part 43: Maintenance, preventive maintenance
14 CFR Part 121: Operating requirements
ATA Spec 100: Manufacturer's technical data
ATA iSpec 2200: Information standards for aviation
S1000D: International specification for technical publications

Document Types¶

Maintenance Documentation¶

Aircraft Maintenance Manual (AMM):

Primary reference for maintenance procedures:

System descriptions
Maintenance procedures
Component removal/installation
Troubleshooting
Testing procedures

Component Maintenance Manual (CMM):

Detailed component-level procedures:

Disassembly
Inspection
Repair
Reassembly
Testing

Illustrated Parts Catalog (IPC):

Parts identification and ordering:

Exploded views
Part numbers
Effectivity
Vendor information

Operations Documentation¶

Flight Manual/Pilot Operating Handbook:

Aircraft limitations
Normal procedures
Emergency procedures
Performance data
Weight and balance

Minimum Equipment List (MEL):

Allowed inoperative items
Operational conditions
Maintenance procedures

ATA Numbering System¶

Chapter Organization¶

Standard chapter numbering for all aircraft:

Chapter	System
05	Time Limits/Maintenance Checks
21	Air Conditioning
22	Auto Flight
23	Communications
24	Electrical Power
27	Flight Controls
28	Fuel
29	Hydraulic Power
32	Landing Gear
34	Navigation
49	Airborne Auxiliary Power
52	Doors
71	Power Plant

Section-Subject Structure¶

Chapter 32: Landing Gear
├── 32-00: General
├── 32-10: Main Gear and Doors
├── 32-20: Nose Gear and Doors
├── 32-30: Extension and Retraction
├── 32-40: Wheels and Brakes
└── 32-50: Steering

Maintenance Manual Structure¶

AMM Task Structure¶

# TASK 32-40-01-400-801
# Main Wheel Assembly - Removal

## 1. General

### A. This task provides instructions for removal of the
main wheel assembly from the aircraft.

### B. Reason for Task
- Tire replacement
- Wheel inspection
- Brake maintenance

## 2. Job Set-Up Information

### A. Referenced Information

| Reference | Title |
|-----------|-------|
| AMM 32-40-01-400-802 | Wheel Installation |
| AMM 32-40-11-400-801 | Tire Replacement |
| CMM 32-40-01 | Wheel Overhaul |

### B. Consumable Materials

| Item | Specification |
|------|---------------|
| Lubricant | MIL-PRF-81322 |
| Safety Wire | MS20995C32 |

### C. Special Tools

| Tool | Part Number |
|------|-------------|
| Axle Jack | T-32-001 |
| Wheel Dolly | T-32-002 |

### D. Support Equipment

- Hydraulic jack, 10-ton capacity
- Jack stands (2)

## 3. Procedure

⚠️ **WARNING**: Ensure aircraft is properly supported
before raising landing gear.

⚠️ **WARNING**: Deflate tire before removing wheel
to prevent injury from sudden release.

### A. Preparation

1. Position aircraft on level surface.

2. Install safety devices:
   a. Position wheel chocks at opposite gear.
   b. Install gear downlock pins.

3. Connect ground power if required for
   brake release.

### B. Wheel Removal

4. Deflate tire:
   a. Remove valve cap.
   b. Depress valve core until fully deflated.
   c. Verify zero pressure on gauge.

5. Position axle jack under axle:
   a. Align jack pad with jack point.
   b. Raise jack until wheel clears ground
      by 2 inches minimum.

6. Remove axle nut:
   a. Remove cotter pin and discard.
   b. Remove axle nut (retain for reinstallation).
   c. Remove washer.

7. Remove wheel assembly:
   a. Pull wheel straight off axle.
   b. Guide wheel onto dolly.
   c. Secure wheel on dolly.

### C. Post-Removal

8. Inspect axle:
   a. Check for scoring or damage.
   b. Verify bearing races are secure.
   c. Document any findings.

9. Install protective cover on axle.

## 4. Close-Up

### A. Lower and remove jack equipment.

### B. Return tools to tool crib.

### C. Complete work order documentation.

S1000D Standard¶

Data Module Concept¶

S1000D uses modular data units:

<dmRef>
  <dmRefIdent>
    <dmCode modelIdentCode="AIRCRAFT"
            systemDiffCode="A"
            systemCode="32"
            subSystemCode="4"
            subSubSystemCode="0"
            assyCode="01"
            disassyCode="00"
            infoCode="040"
            infoCodeVariant="A"/>
  </dmRefIdent>
</dmRef>

Data Module Types¶

Type	Code	Content
Description	018	System description
Procedure	040	Step-by-step task
Fault Isolation	300	Troubleshooting
Parts Data	941	Parts information

Procedural Markup¶

<proceduralStep>
  <para>Remove the wheel assembly:</para>
  <proceduralStep>
    <para>Pull wheel straight off axle.</para>
  </proceduralStep>
  <proceduralStep>
    <para>Guide wheel onto dolly.</para>
  </proceduralStep>
</proceduralStep>

<warning>
  <warningAndCautionPara>
    Ensure tire is fully deflated before removal.
  </warningAndCautionPara>
</warning>

Illustrated Parts Data¶

IPC Structure¶

# 32-40 WHEELS AND BRAKES
# Fig. 1 - Main Wheel Assembly

[Exploded View Illustration with Callouts]

| Item | Part Number | Description | Qty |
|------|-------------|-------------|-----|
| 1 | 123-456-001 | Wheel Half, Outboard | 1 |
| 2 | 123-456-002 | Wheel Half, Inboard | 1 |
| 3 | 123-456-003 | Tire Assembly | 1 |
| 4 | 123-456-004 | Bearing, Outer | 1 |
| 5 | 123-456-005 | Bearing, Inner | 1 |
| 6 | 123-456-006 | Seal | 2 |
| -7 | 123-456-007 | Bolt (8 req) | AR |

Notes:
- Item preceded by dash (-) is not illustrated
- AR = As Required

Effectivity¶

Document which aircraft configurations apply:

## Effectivity

This data applies to:
- Aircraft Serial Numbers 001 through 150
- With modification MOD-2024-001 incorporated
- Excluding aircraft with optional equipment OPT-32-001

Troubleshooting Documentation¶

Fault Isolation Procedure¶

# TASK 32-00-00-810-801
# Landing Gear - Fault Isolation

## Fault: Gear Fails to Retract

### Step 1: Verify Hydraulic Pressure

Check hydraulic system pressure gauge.

| Result | Action |
|--------|--------|
| Below 2800 psi | Go to ATA 29 Hydraulics |
| 2800-3000 psi | Go to Step 2 |

### Step 2: Check Gear Door Operation

Observe gear door indicators.

| Result | Action |
|--------|--------|
| Doors not opening | Go to Step 3 |
| Doors opening | Go to Step 4 |

### Step 3: Inspect Door Actuator

A. Access door actuator per AMM 32-10-00.
B. Check actuator for:
   - Hydraulic leaks
   - Electrical continuity
   - Mechanical binding

| Finding | Action |
|---------|--------|
| Leak detected | Replace actuator |
| No continuity | Check wiring |
| Mechanical bind | Lubricate per AMM |

Writing Standards¶

Simplified Technical English (STE)¶

Aerospace uses controlled language:

Rules: - Use approved words only - One word, one meaning - Short sentences (max 20 words procedural, 25 descriptive) - Active voice - Simple verb tenses

Examples:

Avoid	Use
Optimum	Best
Utilize	Use
Accomplish	Do
Initiate	Start
Terminate	Stop
Permit	Let

Summary¶

Aerospace documentation requires:

Compliance with ATA/S1000D standards
Simplified Technical English
Precise procedural writing
Complete effectivity documentation
Rigorous review and approval processes

The consequences of unclear aerospace documentation can be severe, making accuracy and clarity paramount.