CARs Rest Rules Analysis — Feature #1908

Updated: 2026-06-26 · Audited: 2026-06-26 · Status: DRAFT (early research document) · Created: 2026-03-03 · Author: ALPA Bot

Overview

Scope: CARs Part VII Subpart 5 (705) — Airline Operations ONLY (equivalent to USA Part 121 / Part 117)

• CARs 705 — Airline Operations — ✅ IN SCOPE
• CARs 702 (Aerial Work), 703 (Air Taxi), 704 (Commuter) — ❌ OUT OF SCOPE

Regulation: Canadian Aviation Regulations (SOR/96-433) §700.19 onward — Flight Crew Member Fatigue Management
Related Work Item: Feature #1908 — FTDT Rest Rules

CARs Regulatory Framework

Division III (§700.19 onwards): Flight Crew Member Fatigue Management

• §700.19 — Application and time references (general requirements)
• §700.100 — Medical evacuation flights (Division IV)
• §700.200 — FRMS exemption framework (Division V)

Current ALPA Mobile CARs Implementation Status

Gap: Rest requirement rules (§§700.40–700.43, §700.50, §700.70) largely unimplemented. See the TDD Implementation Plan for full status.

Key Differences: CARs vs. Part 117

Open Questions Resolved

The following questions from the original analysis have been resolved by extracting the full regulatory text:

Data Model Enhancements Required

New properties for DutyPeriod_CAN base class:

// CARs rest requirements
public TimeSpan PreDutyRestDuration_CAN { get; set; }
public DateTimeOffset PreDutyRestStart_CAN { get; set; }
public DateTimeOffset PreDutyRestEnd_CAN { get; set; }

// CARs time zone tracking
public int TimeZoneDifferenceFromHomeHours { get; set; }
public double HoursAwayFromHomeConsecutive { get; set; }

// CARs 705 — reserve tracking
public int CARsOperationType { get; set; } = CARsOperationType.Airline_705;

// FRMS exemption flag
public bool HasFRMSExemption { get; set; }
public string FRMSExemptionNumber { get; set; }

Validation Architecture

New validation class: FTDTRestValidator_CAN (parallel to FTDTRestValidator_USA)

Calculator integration:

public static void CalculateDutyPeriod(IDutyPeriod dutyPeriod)
{
    // Existing calculations...

    // NEW: Validate CARs rest requirements
    FTDTRestValidator_CAN.ValidatePreDutyRest_CAN(dutyPeriod);
    FTDTRestValidator_CAN.ValidateWeeklyRest_CAN(dutyPeriod);
    FTDTRestValidator_CAN.ValidateTimeZoneRest_CAN(dutyPeriod);  // §700.42
    FTDTRestValidator_CAN.ValidatePositioningRest_CAN(dutyPeriod); // §700.43

    if (dutyPeriod.HasFRMSExemption)
        FTDTRestValidator_CAN.ValidateFRMSExemption_CAN(dutyPeriod);
}

Required Documentation Status

References

• CARs 705 Full Text — complete §§700.19–700.72 regulatory text
• CARs §700.19 Full Text — application rules, definitions, FRMS framework
• TDD Implementation Plan — Phase 1 covers CARs rest rules (49 test cases)
• CARs Calculator — implemented reference with all tables
• Regulatory Extracts Index