Assessment of Staffing Needs of Systems Specialists in Aviation (2013) / Chapter Skim
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4 FAA Approaches to Estimating Staffing of Airway Transportation Systems Specialists
4 FAA Approaches to Estimating Staffing of Airway Transportation Systems Specialists
Pages 64-78
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From page 64... ...
The comparison between the two FAA Airway Transportation Systems Specialists (ATSS) staffing models and their evaluation against explicit, documented criteria together provide a logical basis for future approaches that are likely to lead to valid models with practical utility for both staffing level decisions and allocations of a predetermined staff level to sites and tasks.
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From page 65... ...
There were no data on reliability or validity of staffing predictions of this model, although users appeared to trust its outputs. Tech Ops District Staffing Model The Tech Ops District Model was developed in 2006 and updated in 2007 as an alternative to WSSAS.1 It is a regression model based on then-existing staffing levels and six high-level input variables, including a number of large Terminal Radar Approach Control (TRACON)
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From page 66... ...
. Note that "predictive ability" as used by Grant Thornton means the ability to accurately estimate changes in staffing levels as new equipment enters the NAS.
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From page 67... ...
Finding 4-2: The WSSAS model made no prediction of outcomes such as the impact of staffing levels on NAS availability and safety. Findings and Conclusions on the Tech Ops District Model The Tech Ops District Model was an allocation model only (a model aimed at distributing available resources effectively, irrespective of their collective adequacy)
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From page 68... ...
components based upon number workforce in baseline year against and additive, closely linked to the regression and types of systems maintained existing drivers. The regression model WSSAS model.
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From page 69... ...
Plans to outputs. Book 2A report gives overall apply an organization-specific version staffing levels for each unit for of overhead within the model for current and previous years with the District, Service Area, and National added allowances.
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From page 70... ...
: staffing vs. time study Other data collected from systems as above, namely: FSEP with improved PFF to better (see Chapter 3 for fed by a combination of technicians D • istrict needs -- Number of predict future demand.
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From page 71... ...
aTech Ops Models: WSSAS and District Model. Personal communication from the FAA to the Committee on Staffing Needs of Systems Specialists in Aviation, November 29, 2012.
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From page 72... ...
The committee advises against the Tech Ops District Model as a source of either framework or data for future work, and this report does not consider it further as a basis for FAA staffing models. Finding 4-3: The Tech Ops District Model was an allocation model and not a sufficiency staffing model.
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From page 73... ...
Other FAA Staffing Models An effort within the FAA's Office of Aviation Safety (AVS) organization resulted in creation of model criteria for staffing standards for the aviation safety inspector workforce (National Research Council, 2006)
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From page 74... ...
The LCOM simulation model integrates stochastic features such as queuing, Markovian processes, and vast amounts of available maintenance data to support a wide range of investigations into resourcing, skills required, staffing levels, performance, and consequences. Several iterations of the Air Force staffing models are usually run to help establish suitable outputs for creating staffing scenarios, which are often tied to peacetime or wartime utilization of the aircraft fleet.
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From page 75... ...
The committee concluded from its analysis that the approach suggested by Grant Thornton was likely to be successful if implemented because it is based on the logically sound approach of the WSSAS model, rather than on the Tech Ops District allocation model. The WSSAS model was correctly based on the counts of each equipment type at each location and on the times required for the different maintenance needs of those pieces of equipment.
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From page 76... ...
. Their model used a stochastic modeling approach with different technician skills, an exponential relationship between failure rate and duration of repair, and a valid model of redundancy to predict the consequences of different staffing levels.
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From page 77... ...
That decision should not be based on cost and convenience alone. SUMMARY AND RECOMMENDATIONS This chapter has taken the modeling approaches and criteria developed in Chapter 3 from staffing model knowledge and has applied them to the WSSAS model, the Tech Ops District Model, and the proposed Grant Thornton approach to modeling.
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From page 78... ...
Recommendation 4-5: The FAA should ensure that output reports from the system predict consequences such as overall NAS availability time, deferred preventive maintenance activities, and overtime required. Recommendation 4-6: The FAA should ensure that output reports are tailored closely to the needs of FAA's internal users at multiple organizational levels, in order to increase transparency of, and user trust in, the model.
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