CAS-5 Fatigue Risk Model

The CIRCADIAN® Alertness Simulator (CAS) is the longest operationally used fatigue model with a 20-year validated record of reducing errors, incidents, and injuries in FRMS applications.

Download the CAS 5 Crew Planners BrochureThe latest version of CAS (CAS-5) is specially optimized for airline FRMS to assess fatigue risk in crew pairings, bidlines, and day of operations data. Some of the key features of CAS-5 are:

  • Designed for short haul/commuter, long haul, freight and corporate operations
  • Can track pilots, flight attendants, and ground crew
  • Supports crew planning, crew pairings, bidlines, and crew requirements
  • Scientifically optimized with sleep/fatigue data
  • Full featured: crew type, duty type, rest type, time zone shifts, etc.
  • Personalized to individual sleep

Crew Planning with our Partners at AD OPT

Empower your crew planners to address the risk of fatigue during the build of pairings and bidlines, and fix fatigue risk issues before sequences are flown. AD OPT, a division of Kronos, and CIRCADIAN® have partnered to allow your planners to assess fatigue risk on their screens when generating crew pairings and bidlines.

The 'engine' at the heart of the fatigue assessment is CIRCADIAN®’s scientifically validated fatigue risk model CAS™. The direct interface between Altitude-Pairing, PBS screens, and CAS helps you show effective fatigue minimized schedules and diminish the risk of noncompliance with FRMS targets.


FACTS™ - Aviation Fatigue Incident Analysis

You don’t need a panel of experts to determine how many incidents reports are caused by fatigue–related errors, or the annual cost of fatigue events.

FACTS™ (Fatigue Accident/Incident Causation Testing System) solves this problem using a scientifically validated expert web-based system which objectively analyzes fatigue probability. FACTS™ probability judgments correlate 86% with the decisions of an expert human panel.

FACTS™ can be linked to ASAP and fatigue reports to provide an objective assessment of fatigue with specific versions available for flight and ground crews. CIRCADIAN® also licenses a secure corporate version of FACTS™ which enables to you to store and analyze all fatigue reports and causal factors.

Sign up for a Complimentary 5-Case trial to FACTS™

FRMS Training and Audits for Airlines

Fatigue Review Committee Training & Certification

The expertise of the Fatigue Safety Action Group/Fatigue Review Committee is critical to the success of an airline’s FRMS. CIRCADIAN® provides training and certification to bring all FRC stakeholder representatives to the required ICAO-defined level of scientific and technical competence. Topics include:

  • Scientific basis for aviation FRMS.
  • Effective FRMS implementation strategies.
  • Managing and auditing the FRMS processes.
  • Tools and software for FRMS safety assurance.
  • FRMS promotion & education processes.
  • Aircrew fatigue training.

 CIRCADIAN® supplies a broad range of training options for aircrew to meet the requirements of HR 5900 and ICAO guidelines. These include:

  • Classroom training
  • Train-the-Trainer
  • Aviation Fatigue Training Online

Scientific Expert Support and Change-Management Consulting

FRMS Audits

CIRCADIAN®’S experienced team provides FRMS audits for airlines around the world. We have worked with and assessed airline fatigue management plans against the National Regulatory Authorities, including CASA, EASA, and the FAA.

FRMS Implementation and Change Management Consulting

CIRCADIAN®, with its proven change management process, is the recognized industry leader in helping organizations determine and implement fatigue risk management systems. Working with CIRCADIAN®, you can rest assured that your FRMS will incorporate all necessary legislated and negotiated requirements while supporting operational efficiencies and safety

CIRCADIAN® Aviation Research: Data Collection & Analysis

CIRCADIAN® has the global scientific resources and 20-years of expertise in conducting large scale studies of aircrew fatigue in passenger and freight operations. We have helped define the standard for collecting sleep, fatigue and aircrew performance data in airline studies. By collecting sleep and alertness data in its own operations, an airline can refine and optimize the alertness predictions to incorporate the unique characteristics of its operators in the CAS-5 fatigue risk model.


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