TSS CRJ-700 - User Manual

1. General
A. The maintenance procedure that follow is for the removal of contamination from the pilot
S2/copilot S1 static line.
2. Job Set−Up Information
A. Tools and Equipment
REFERENCE DESIGNATION
CTR200−580 OR EQUIVALENT Cart − Nitrogen, High and Low Pressure, Hangar Use (2 bottles)
G601R121605−1 Test Panel − Gaseous (0−100 psi)
ADCRJ−612 Connector Kit − Pitot Static Pressure Test
9235006 (FUTURE
PROCUREMENT P/N:50017A42−
6−0120 AND P/N:50017A43−6−
0120
Purging Kit − Drain Valves
50017A42−6−0120 Purging Hoses Assembly − Static Drain, 2 Pin
50017A43−6−0120 Purging Hoses Assembly− Pitot Drain, 3 Pin
B. Consumable Materials
REFERENCE DESIGNATION
05−002 Nitrogen, technical
C. Reference Information
MANUAL NO REFERENCE DESIGNATION
CSP−B−001 TASK 12−00−00−867−801 Standard Aircraft Configuration for Maintenance
CSP−B−001 TASK 24−00−00−910−801 Electrical/Electronic Safety Precautions
CSP−B−001 TASK 34−11−00−790−805 Leak Test of the P2 and Copilot S1 Systems
3. Job Set−Up
A. Make sure that the aircraft is in the standard configuration for maintenance
(TASK 12−00−00−867−801).
**ON A/C ALL
TASK 34−11−00−100−805−A01−PSA
Static Line Pilot S2/Copilot S1 Contamination Removal
Internal PSA Document
EFFECTIVITY: Ref page 1 of Blue Page
CRJ-700/900
AIRCRAFT MAINTENANCE MANUAL
PSA AIRLINES, INC REVISION
AMM - Insert after Task 34-11-00-100-805-A01 of AMM 34-11-00
34-11-00-100-805-A01-PSA Rev D
Remove Rev 34-11-00-100-805-A01-PSA Rev C dated 04/03/17 and insert 34-11-00-100-805-A01-PSA Rev D dated 08/13/18
08/13/18
Page 1 of 5

Audited By TSS Dept. 10/17/18
Blue Page Current For Rev. 59

Audited By TSS Dept. 05/02/19
Blue Page Current For Rev. 61

Summary

Static Line Pilot S2;Copilot S1 Contamination Removal

General

Procedure for removing contamination from pilot S2/copilot S1 static line.

Job Set-Up Information

Details on tools, equipment, consumable materials, and reference information.

Job Set-Up

Ensuring aircraft is in standard configuration for maintenance.

Procedure Steps

Safety Precautions

Obeying electrical/electronic safety precautions and opening circuit breakers.

Disconnecting and Capping Lines

Disconnecting static connector from ADC 2 and installing a cap.

Removing Drain Collector Tubes

Removing drain collector tubes from static line drains and cleaning contamination.

Installing Test Adaptors

Installing pitot-static test adaptors on pitot-static heads.

Connecting Airflow and Purging

Connecting Test Adaptors and Hoses

Connecting static hose assemblies to test adaptors and air test panel.

Airflow and Purging Execution

Starting airflow, connecting purging hose, and ensuring airflow.

Post-Purging Steps

Decreasing airflow, removing adaptors, and reinstalling drain collector tubes.

Close Out and Final Checks

Leak Test Note

Note regarding leak test requirement based on fittings and regulatory authority.

Work Area Cleanup

Removing all tools, equipment, and unwanted materials from the work area.

Closing Access Door

Closing the main avionics compartment door after procedure completion.

Overview

1. Function Description
2. Usage Features
3. Maintenance Features

The provided document outlines the procedures for the "Static Line Pilot S2/Copilot S1 Contamination Removal" for the CRJ-700/900 aircraft, as part of the Aircraft Maintenance Manual (AMM). This procedure is critical for maintaining the integrity and accuracy of the aircraft's static pressure system, which is vital for flight instruments such as altimeters, vertical speed indicators, and airspeed indicators. Contamination in these lines can lead to erroneous readings, posing a significant safety risk during flight operations.

Function Description

The primary function of this procedure is to remove contamination from the static lines connected to the pilot S2 and copilot S1 positions. These static lines are part of the aircraft's pitot-static system, which measures ambient air pressure. The static ports, typically located on the fuselage, sense static air pressure, which is then transmitted through tubing to various flight instruments. Any foreign material, such as moisture, debris, or insects, within these lines can obstruct the pressure sensing, leading to inaccurate instrument readings. The contamination removal process ensures that the static lines are clear and unobstructed, allowing for precise pressure measurements and, consequently, reliable flight instrument operation. This contributes directly to the aircraft's airworthiness and operational safety. The procedure involves a systematic purging of the static lines using dry compressed air, ensuring that any accumulated contaminants are expelled from the system. This is achieved by connecting specialized test adaptors and purging hoses to specific points in the static system and then applying controlled airflow.

Usage Features

The contamination removal procedure is a maintenance task performed by qualified personnel. It is initiated when contamination is suspected or as part of a scheduled maintenance program. The process requires specific tools and equipment, including a nitrogen cart for compressed air, a gaseous test panel, a pitot static pressure test connector kit, and purging kits with drain valves and hoses.

Key usage features include:

• Controlled Airflow Application: The procedure specifies starting an airflow at 20 psi (137.90 kPa) into the P1 static port S2 and P2 static port S1. This controlled pressure is crucial to effectively dislodge and remove contaminants without damaging the delicate static system components.
• Targeted Purging: Purging hoses are connected to specific openings, including the static connector for the ADC 2, the S2/S1 drain assembly on the ADC 2 static line, and the S2/S1 drain assembly on the static manifold. This targeted approach ensures that all critical sections of the static lines are thoroughly purged.
• Verification of Contamination Removal: The procedure implicitly requires visual inspection for contamination during the process, particularly when removing drain collector tubes and after purging. The note "Make sure that there is no fluid or other contamination on the pitot-static head" emphasizes the importance of verifying the effectiveness of the cleaning.
• Systematic Disconnection and Reconnection: The process involves a precise sequence of disconnecting and reconnecting components, such as static connectors, drain collector tubes, and pitot-static test adaptors. This ensures that the system is properly isolated for purging and then correctly restored to its operational configuration.
• Safety Precautions: The procedure highlights critical safety measures, such as opening, safetying, and tagging circuit breakers for pitot head heaters to prevent burns. It also includes a caution to ensure that pitot and/or static lines are disconnected from aircraft equipment before applying pressurized nitrogen to prevent damage.
• Integration with Other Maintenance Tasks: The procedure is designed to be integrated with other maintenance tasks, such as ensuring the aircraft is in a standard configuration for maintenance and adhering to electrical/electronic safety precautions. It also references a leak test procedure (TASK 34-11-00-790-805) as a follow-up, although notes indicate that this may not always be required depending on the fittings and regulatory mandates.

Maintenance Features

The document itself is a maintenance feature, providing a detailed, step-by-step guide for technicians. It ensures consistency and accuracy in performing the contamination removal.

Key maintenance features include:

• Detailed Step-by-Step Instructions: The procedure is broken down into clear, numbered steps, guiding the technician through each phase of the contamination removal, from initial setup to close-out. This minimizes ambiguity and reduces the chance of errors.
• Required Tools and Equipment List: A comprehensive list of necessary tools and equipment is provided, ensuring that technicians have all the required items before starting the task. This includes specialized carts, test panels, connector kits, and purging kits.
• Consumable Materials Specification: The document specifies "Nitrogen, technical" as a consumable material, indicating the type of gas required for purging, which is essential for effective and safe cleaning.
• Reference Information: The inclusion of "Reference Information" with manual numbers and designations (e.g., Standard Aircraft Configuration for Maintenance, Electrical/Electronic Safety Precautions, Leak Test of the P2 and Copilot S1 Systems) directs technicians to other relevant documentation, ensuring a holistic approach to maintenance.
• Circuit Breaker Management: Specific circuit breakers (HEATERS PITOT R and HEATERS PITOT L) are identified for opening and tagging. This is a critical safety measure to prevent accidental activation of heaters during maintenance, which could cause burns or damage.
• Access Door Identification: The procedure specifies opening the "Main Avionics Compartment Door" (Panel 811), clearly indicating the access point required for the task.
• Notes and Cautions: Throughout the procedure, "NOTE" and "CAUTION" advisories are strategically placed to provide additional information, highlight critical safety points, or explain specific conditions (e.g., the attachment method of drain collector tubes, the importance of disconnecting lines before pressurization, or conditions under which a leak test might not be required).
• Contamination Collection and Removal: The instruction to "Remove any contamination collected in the two drain collector tubes" is a direct maintenance feature, ensuring that removed contaminants are properly disposed of and do not re-enter the system.
• Post-Maintenance Verification: Although the leak test is noted as not always required, its mention as a potential follow-up step underscores the importance of verifying the system's integrity after maintenance. The instruction to "Remove all tools, equipment, and unwanted materials from the work area" and "Close the access door" ensures a clean and secure work environment post-maintenance.
• Revision Control: The document includes revision information (e.g., "Rev D dated 08/13/18"), which is a crucial maintenance feature for tracking changes and ensuring that technicians are always using the most current and approved procedures. This is vital for regulatory compliance and safety.
• Visual Aid: The inclusion of "Figure 706: Static Line Pilot S2/Copilot S1 - Cleaning/Painting" on the last page serves as a visual aid, helping technicians to identify components and understand the physical layout of the system being worked on. This enhances clarity and reduces potential for misidentification of parts.

TSS CRJ-700 Specifications

General

Aircraft Type	Regional Jet
Model	CRJ-700
Cockpit Crew	2
Manufacturer	Bombardier
Length	106 ft 8 in (32.5 m)
Wingspan	76 ft 3 in (23.2 m)
Height	24 ft 10 in (7.6 m)
Service Ceiling	41, 000 ft (12, 500 m)
Engines	2 × General Electric CF34-8C5 turbofans