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Previous research found that a peripherally-located instrument landing system (ILS) embedded in a head-up display (HUD) supported equal or better control of glide-path during simulated approach and landing than the traditional centrally-located MIL-STD ILS. Here, we used a dualtask paradigm to examine whether gains in landing precision with the peripheral ILS are also accompanied by a reduction in mental workload. Participants controlled glide-path during simulated instrument landings while simultaneously performing a secondary task monitoring a head-down engine display for fault states. We varied the type of ILS (peripheral vs. MIL-STD) and assessed mental workload using the NASA-TLX and primary and secondary task performance measures: glide-path errors and engine-fault detection sensitivity, respectively. We found equivalent glide-path errors for the two displays, but the peripheral ILS produced lower subjective estimates of mental workload and significantly less dual-task decrement in engine-monitoring sensitivity, indicating that this display affords effective glide-path control with lower reduced mental demand.