Cost and Quoting

What Drives Cost Per Unit in Space Payload and Avionics Builds

Cost per flight avionics unit is dominated by rad-hard parts and test time, not material. Here is how to build the five cost buckets and where quotes go wrong.

Cost per flight avionics unit rarely tracks material weight. A payload board might use 40 dollars of laminate and 15 dollars of solder yet cost 60000 dollars to build. The money sits in radiation tolerant parts, environmental test time, touch labor under a microscope, and the scrap you eat when a 40000 dollar assembly fails at vibration. A defensible quote splits into five buckets: parts, labor, test and machine time, scrap and rework, and loaded overhead. Get the mix roughly 45 percent parts, 25 percent labor, 15 percent test, and the rest scrap and overhead, and you are in the right zip code for a low volume payload build.

The single largest line is usually radiation hardened components. A commercial op amp costs 3 dollars; the QMLV rad-hard equivalent runs 400 to 2000 dollars, a 100x to 600x premium, and a rad-tolerant FPGA can pass 90000 dollars. Radiation Part Premium multiplies each part baseline by its screening and hardness uplift, so a 200 line bill of materials does not hide a six figure surprise. Budget 10x to 100x over commercial for anything that must survive total ionizing dose above 30 krad, and treat single lot date code buys as mandatory, which kills the volume discounts a commercial estimator would assume.

Touch labor in avionics is slow and skilled. IPC J-STD-001 Class 3 with the Space Addendum puts a certified operator at 45 to 85 dollars per hour fully burdened, and a complex board can take 20 to 40 hours to populate, inspect, and coat. Harness Routing Labor and Cleanroom Assembly Load convert connector counts and station occupancy into hours you can actually price: a 180 contact harness at 12 hours and 65 dollars is 780 dollars before test. Do not forget inspection, since Class 3 demands 100 percent inspection, which often doubles the assembly hour count on dense boards that a commercial quote would price once.

Environmental test is a capacity cost, not a per unit cost, so you amortize it. A thermal vacuum chamber runs 1500 to 4000 dollars per day loaded, and a 22 hour qualification thermal cycle sequence plus pump down can tie a chamber up for 3 to 5 days, or 6000 to 20000 dollars. A shaker day for random vibration lands near 2000 to 5000 dollars including a fixture. Thermal Cycle Test Capacity and Vibration Test Schedule tell you how many units share that fixed cost. Spread over a 4 unit lot, a 15000 dollar test campaign adds 3750 dollars each; over a single unit it adds the full 15000 to one price.

Scrap in this category is brutal because value is added late. A board that fails burn-in after coating has already absorbed parts, labor, and screening, so scrapping it can destroy 25000 to 50000 dollars. Nonconformance Cost captures the full recovery burden of a material review board disposition: engineering hours, retest, and documentation, often 1200 to 4000 dollars per event even when the part is used as is. Assume a 3 to 8 percent nonconformance rate on new designs and carry it as an explicit line. Quotes that assume zero escapes are the ones that quietly lose money on the first article and every unit after it.

Overhead in a space shop is heavy. An ISO Class 7 cleanroom costs 15 to 40 dollars per square foot per month to run, and a certified quality system, ITAR controls, and configuration management push G and A well above commercial electronics. Traceability Workload alone can add 8 to 12 percent to touch labor because every lot, date code, and serial must be recorded and audited. Burn-In Capacity time carries overhead too: an oven pulling 168 hours of power and monitoring is a real utility and calibration cost, not free dwell. Fold these into the loaded rate instead of pretending the floor space and paperwork are free.

A quote survives customer scrutiny when every bucket ties to a document. Parts price from a quoted bill of materials with Radiation Part Premium uplifts and single lot date codes. Labor ties to standard times from Harness Routing Labor and Cleanroom Assembly Load. Test cost ties to chamber and shaker days from the capacity tools times a published day rate. Scrap ties to a stated nonconformance percentage through Nonconformance Cost. Add loaded overhead and a fee of 8 to 12 percent. Show the buyer the yield assumption and lot size on the same page, because both swing the unit price by 2x on small builds.

Estimates blow up in predictable ways. Quoting a shared test cost across many units, then delivering only one, strands the whole fixed test bill on that part. Assuming commercial lead times when rad-hard parts run 30 to 50 weeks forces expedite fees of 15 to 40 percent. Pricing first pass yield at 100 percent ignores the 3 to 8 percent nonconformance reality and the coating rework at 0.75 hours a board. Forgetting that Class 3 inspection roughly doubles labor understates the hour count. And under-booking traceability, which is 8 to 12 percent of touch labor, is not a rounding error, it is a margin killer on every serial number.

Published 2026-07-02.